Add a new Arch Roof Builder
Fix bug if user enter thickness = 0
Implement Overhang
Ready for merge : fix issues #1618 and #1607

Implement getSubVolume to cut wall with roof.
Now Roof is not hidden when removing it to a wall.
+ fix crash in spnav settings dialog while changing language, improve whitespaces
+ when creating picture check whether pbuffer is supported
use 4 spaces to indent XML output
use ISO 8601 timestamps including timezone

for creation and last changed properties
+ utc time with timezone
 + implement PrefQuantitySpinBox
+ fixes #0001849: Enable Spin Boxes support for Pad, Fillet and Chamfer
Draft: small fix in Draft.py
Regenrated the branch (rebase failed)
Fixed the module copy path
Removed autotools makefile template
Fixed small error in concrete material
+ merge project on app level
Drawing: added new set of empty templates - issue 1856
Material: Added mk2's material cards
Merge branch 'master' of ssh://git.code.sf.net/p/free-cad/code