ADD:
- one might also crop white parts on top-left and keep an index on the db for each node for that. or not.

- rename node
- BORDERS around sketchwidget (gtkrc?)
- resize canvas (pages of 480 pixels?)
- import images (minimal vector ops might be needed here, to move and resize the image)
- change canvas background color (just to keep up with xournal :P )
- erase by drawing over option?
- maybe leftarrow-rightarrow change focus and uparrow-downarrow walk the tree? (need a way fix the textview issue)
- keep/show last modified date for every node
- search
- adjustable text properties (formatting)
- richtext editing (read: allow formatting)
- redo eraser/pencil/color toolbar logic some more

- add a swatches toolbar? at least "last used 4 colors" somewhere?

FIX:
- sketchnamed children of the textnamed node gets cropped when you collapse/expand its parent
- gc/bitmap logic (when drawing over something else)
- make drawing shapes faster (=queue_draw less)
- make undo for drawing shapes consume less memory
- creating a childnode to the rootnode is not possible
- fix/add hook: make tools menu not appear when no node is selected
- probable bug: ending drawing beyond canvas might make undo a dull boy (crash protection in place)
- node order -- column `ord` not saved (FIXME)
- change detection might be too sensitive, test
- offering filenames on newfile/savefile dialogs doesn't work as it should
