+ fix crash when trying to edit broken revolve object
+ fix override/restore cursor issue with task panel
+ implement solve() in Python API of SketchObject
+ support compounds of wires or faces for extrusion with tapered angle
+ split create/edit sketch command into two commands
Moved to InputField widget in ship creation
Added units mangement to the outline drawing tool
Added helpers for mass, time and angle units
Added units mangement to the transversal areas tool
Corrected the angle bounds
Added units mangement to the hydrostatics tool
Fixed bad integer usage
Fixed box generation for small draft values
Added spreadsheets to the transversal areas tool
Changed the spreadsheet label
Fixed worng variable
Added spreadsheets to the hydrostatics tool
+ fix crash when trying to edit broken revolve object
automatically find the OpenSCAD binary on Mac OS X
renable DRAWEXE exporter

This reverts commit 4c48bdf2166f273e60bcaf95281b7dde726db2f5.