+ do not allow negative numbers in fillet and chamfer panel
Arch: moved ifc-related functions to importIFC
Merge branch 'master' of ssh://git.code.sf.net/p/free-cad/code
+ add QuantitySpinBox
Transferred import-export related preference pages to a separate group
Arch: Starting Panel tool
Arch: Further work on panel
Arch: small fix in panel
Arch: Updated preferences page for panels
Arch: added panel to  cmakelist
+ add missing headers
Merge branch 'master' of ssh://git.code.sf.net/p/free-cad/code
+ proper handling of group separator in InputField and QuantitySpinBox
+ add QuantitySpinBox to widget plugin
+ fix focus issue with QuantitySpinBox and InputField
+ fixes 0001563: Add units to Linear Pattern in PartDesign
+ fix bug in chamfer/fillet when aborting command
+ minor issue solved with message label of linear pattern panel
+ support units in pocket panel
+ support units in groove panel