Replace sys.exit() with raise User Defined exceptions ?

[rjodon]

I see plenty of sys.exit( 'ERROR: displacement {} not found in the model!'.format(disp))
I would rather create a bunch of compas exception class that could be useful and raise them when needed.

[tomvanmele]

agreed. compas_fea needs an exceptions module...

[franaudo]

yeah...that was just to debug...