Turned off HIDE_UNDOC_RELATIONS in Doxygen
+ improve the plane fit from REEN module
+ remove crude workaround as this seems to work now
Draft: small bug fix in DXF importer
Cleaning up my git repo for FreeCAD.

This branch now has just the Sketcher icon fixes, plus a few random comment edits.
Fixed crash reported by sponssi

More info at http://forum.freecadweb.org/viewtopic.php?f=10&t=6965&p=56590
Fixed dumb copy-and-paste error
Fixed a bug that was introduced two commits ago.
Fixed an off-by-one in ViewProviderSketch::combineConstratintIcons

Bug resulted in icons occasionally not being combined into groups,
when they should've been.
Bit of code to make constraint icon text rendering nicer.

This won't be useful unless the font changes, but wanted to add it while
I was thinking about it.
Added screenCoordsOfPath() to View3DInventorViewer
Added bounding boxes for combined constraint icons
Implemented picking of individual constraints from combined icons
Refactoring and small fix in constraint icon bounding boxes