Add a GSettings implementation for IConfMgr

	* configure.ac: Auto-detect gsettings dependencies.  Add a
	--enable-gsettings.  By default, switch to gsettings if all its
	dependencies are present; switch to gconf otherwise.  Define
	preprocessor macros WITH_GSETTINGS and CONFIG_MGR_MODULE_NAME.
	* data/Makefile.am: Declare a new schema sub-directory.
	* data/schemas/gconf/Makefile.am: New file.
	* data/schemas/gconf/nemiver-dbgperspective.schemas: Moved
	src/persp/dbgperspective/schemas/nemiver-dbgperspective.schemas
	into this.
	* data/schemas/gconf/nemiver-workbench.schemas: Moved
	src/workbench/schemas/nemiver-workbench.schemas into this.
	* data/schemas/gsettings/Makefile.am: New file.
	* data/schemas/gsettings/org.nemiver.gschema.xml: Likewise.
	* src/confmgr/Makefile.am: Build either the gsettings backend or
	the gconf one.
	* src/confmgr/gsettingsmgr.conf.in: New file.
	* src/confmgr/nmv-conf-keys.h (CONF_NAMESPACE_NEMIVER)
	(CONF_NAMESPACE_DESKTOP_INTERFACE): Declare new keys.
	(CONF_KEY_NEMIVER_CALLSTACK_EXPANSION_CHUNK): Moved this here from
	nmv-call-stack.cc.
	(CONF_KEY_NEMIVER_WINDOW_WIDTH)
	(CONF_KEY_NEMIVER_WINDOW_HEIGHT)
	(CONF_KEY_NEMIVER_WINDOW_POSITION_X)
	(CONF_KEY_NEMIVER_WINDOW_POSITION_Y)
	(CONF_KEY_NEMIVER_WINDOW_MAXIMIZED)
	(CONF_KEY_NEMIVER_WINDOW_MINIMUM_WIDTH)
	(CONF_KEY_NEMIVER_WINDOW_MINIMUM_HEIGHT): Move these declarations
	here from nmv-workbench.cc.
	* src/confmgr/nmv-gconf-keys-defs.cc: Renamed this from
	src/confmgr/nmv-conf-keys.cc.
	(CONF_NAMESPACE_NEMIVER)
	(CONF_NAMESPACE_DESKTOP_INTERFACE): Define these new keys.
	(CONF_KEY_NEMIVER_WINDOW_WIDTH)
	(CONF_KEY_NEMIVER_WINDOW_HEIGHT)
	(CONF_KEY_NEMIVER_WINDOW_POSITION_X)
	(CONF_KEY_NEMIVER_WINDOW_POSITION_Y)
	(CONF_KEY_NEMIVER_WINDOW_MAXIMIZED)
	(CONF_KEY_NEMIVER_WINDOW_MINIMUM_WIDTH)
	(CONF_KEY_NEMIVER_WINDOW_MINIMUM_HEIGHT): Move these definitions
	here from nmv-workbench.cc.
	* src/confmgr/nmv-gconf-mgr.cc: Include nmv-conf-keys.h.
	(GConfMgr::m_value_changed_signal):  Adjust the type of this signal.
	(GConfMgr::set_key_dir_to_notify, GConfMgr::add_key_to_notify):
	Remove.
	(GConfMgr::get_default_namespace, GConfMgr::register_namespace):
	New functions.
	(GConfMgr::{set,get}_key_value): Add a namespace parameter.
	(GConfMgr::value_changed_signal): Remove the Value parameter.  Add
	a namespace parameter.  Ignore the namespace parameter in the
	definition.
	(client_notify_func): Don't pass any value argument to
	GConfMgr::value_change_signal anymore.
	* src/confmgr/nmv-gsettings-keys-defs.cc: New file.
	* src/confmgr/nmv-gsettings-mgr.cc: Likewise.
	* src/confmgr/nmv-i-conf-mgr.h: Include config.h.
	(IConfMgr::Value): Remove typedef.
	(IConfMgr::set_key_dir_to_notify, IConfMgr::add_key_to_notify):
	Remove functions.
	(IConfMgr::get_default_namespace): New function.
	(IConfMgr::{get,set}_key_value): Add a namespace parameter, with a
	default argument "".
	(load_iface_and_confmgr): New function template.
	* src/dbgengine/nmv-debugger-utils.cc
	(load_debugger_iface_with_confmgr): Renamed
	load_debugger_iface_with_gconf into this.  Use the new
	load_iface_and_confmgr instead of loading the gconf backend of
	IConfMgr systematically.  Use the new
	IConfMgr::register_namespace.
	* src/dbgengine/nmv-debugger-utils.h
	(load_debugger_iface_with_confmgr): Renamed
	load_debugger_iface_with_gconf into this.
	* src/dbgengine/nmv-gdb-engine.cc
	(GDBEngine::Priv::on_conf_key_changed_signal): Adjust signature.
	Get the configuration value from the conf_mgr as it's not passed
	by parameter anymore.
	* src/main.cc: Include nmv-i-conf-mgr.h
	(main): Use the new load_iface_and_confmgr to load the workbench.
	* src/persp/dbgperspective/Makefile.am: There is no more schema
	sub-directory to take care about as it got moved under data/.
	* src/persp/dbgperspective/nmv-call-stack.cc: Include
	nmv-conf-keys.h.
	(CONF_KEY_NEMIVER_CALLSTACK_EXPANSION_CHUNK): Moved declaration into
	into nmv-conf-keys.h and the definition into the IConfMgr
	backends.
	(CallStack::Priv::conf_mgr): New member to cache the conf mgr
	here.
	(CallStack::Priv::init_conf):  Cache the conf mgr into the new
	memver conf_mgr.  Don't call conf_mgr->add_key_to_notify anymore.
	(CallStack::Priv::on_config_value_changed_signal): Adjust
	signature.  Get the key from conf_mgr as it's no more passed as a
	parameter.
	* src/persp/dbgperspective/nmv-dbg-perspective.cc
	(DBGPerspective::on_conf_key_changed_signal): Likewise.
	(DBGPerspective::read_default_config): Pass
	CONF_NAMESPACE_DESKTOP_INTERFACE argument to the namespace of
	IConfMgr::get_key_value as necessary.
	* src/persp/dbgperspective/schemas/Makefile.am: Moved to under data/.
	* src/persp/dbgperspective/schemas/nemiver-dbgperspective.schemas: Likewise.
	* src/workbench/Makefile.am: Don't handle schema (un)install as
	schemas got moved under data/
	* src/workbench/nmv-workbench.cc: Include nmv-conf-keys.h.
	(Workbench::get_configuration_manager): Use
	DynamicModuleManager::load_iface_with_default_manager to load the
	conf mgr.  Use the new IConfMgr::register_namespace API instead of
	the former IConfMgr::set_key_dir_to_notify and IConfMgr::add_key_to_notify.
	* src/workbench/schemas/Makefile.am: Moved under data/.
	* src/workbench/schemas/nemiver-workbench.schemas: Likewise.
	* tests/test-breakpoint.cc (test_main): Use the new
	debugger_utils::load_debugger_iface_with_confmgr
	* tests/test-cpptrait.cc: Likewise.
	* tests/test-deref.cc: Likewise.
	* tests/test-disassemble.cc: Likewise.
	* tests/test-global-variables.cc: Likewise.
	* tests/test-local-vars-list.cc: Likewise.
	* tests/test-overloads.cc: Likewise.
	* tests/test-types.cc: Likewise:
	* tests/test-var-list.cc: Likewise.
	* tests/test-var-path-expr.cc: Likewise.
	* tests/test-var-walker.cc: Likewise.
	* tests/test-varobj-walker.cc: Likewise.
	* tests/test-vars.cc: Likewise.
	* tests/test-watchpoint.cc: Likewise.