Fix modelines
Moved and renamed some tool-related files.
First step of moving tools into appropriate namespaces.
Units: stop newing Unit objects. pass around pointers to "undeletable" Unit objects in the UnitTable. I think we should move to using indexed units, and pass around the index of the unit in the unittable, or smth like that... ?
fix crash on uninitialized unittracker for spinbuttons. fixes crash on changing major grid line number, possibly other random crashes
C++ify expression evaluator.
Enable unit evaluation in toolbars.
Drop GTK+ 2.20 support.
Eliminated duplication of GTK key defines.
Get rid of remaining deprecated GDK Key symbols
Fixing more broken and split doc comments.
Doxygen cleanup.
add undo to SpinButton
add expression evaluator for spinbox input boxes. also knows a little about units. needs more work to fully integrate it in all of inkscape spinboxes also needs documentation rework
add a subclassed spinbutton class. this numeric entry box accepts both ',' and '.' as the decimal point when in numeric mode.