Completely implemented saving/loading of graphs, depended on recent fixes in master (not yet pushed). Loaded nodes are spawned in the position 0,0. Connections loaded intact

Added a number of menu items and implemented Save As functionality. Only supports a single output. If there are multiple outputs in the graph, one will be selected (which is selected is undefined). See BUGS. This behavior is temporary and will be remedied as gegl's serialization limitations are remedied

Cleaned up the source to fix a number of GCC warnings (mostly to do with incompatible pointer types and gobject)

Can delete nodes by pressing the delete key while a node is selected. Property edit pane is currently buggy when deleting nodes but can be refreshed by clicking on a new node again

Added gegl-gtk as a dependency and moved thumbnail preview to the sidebar which now uses a GeglGtkView widget (much cleaner now)

Some property fields are populated when the node is selected. Hanging still often occurs when setting a property.

Working on making properties modified in the Gtk table affect the properties of the node in Gegl. Sometimes hangs: http://pastebin.com/TW6RzW8B

Added a panel in the editor window which is populated with a table of properties whenever a new node is selected. No functionality beyond adding stuff to a Gtk container

Can add a node to the interface layer, which creates an appropriate node on the editor widget with title and inputs

Added method to add a new node to the widget with a specified title, list of inputs, and list of outputs

Can resize nodes and the last node to be moved or resized is moved to the top (might get rid of resizing... not sure how useful it will be)

and private API to set/get them. Also add to-become-public API to create
and dup tiles. In gegl_tile_handler_chain_add(), set the chain's own
storage and cache on the added handlers. Set them on the chain itself
in GeglTileStorage (which is a chain). Port the cache, zoom and empty
tile handlers to use the new stuff.