bolttools with support for 2d tables
2D table support for FreeCAD backend
test data for 2d tables

the common parameters probably need to be slimmed down a bit.
OpenSCAD support for 2D tables
html output for 2d tables
bolttools with better sorting of table indices

closes #73 again
Merge branch 'master' into global
checking column lengths is done while parsing
abort on case differences between model and base

Windows is case insensitive, so case errors sneak in easily, because it
still works. Therefore we are a bit stricter here.