color faces to indicate threads
refactored type checking
added angle type
display units correctly in 2D table html output
changed existing angles to new type in blt files
add Angles to FreeCAD widget

the validator in the AngleWidget is not very strict, but that is
apparently intentional.
set part name as label, not as object name

The former caused all spaces to be converted to underscores in the
treeview.
remove old and ugly hex socket drawings

although there is no replacement yet
nicer output for checks and tasks
display nice error message for invalid parameters

The base function can now use ValueErrors to signal invalid parameter
constellations and provide meaningful error messages that get displayed
in a error dialog.
add parameter check to pipes
new freecad development release
regenerated html