by Jabiertxo Arraiza Cenoz
Hi to all.
Today I want to remove document units from effect.cpp/h to aboid crash
noticed by Tav. Also remove units handle from fillet-chamfer and roughen
Finaly there is two LPE harcoded to use "PX" as document units and we
need to fix it: path_length and ruler
Best of all, Jabier.