Libgeda, add new utility function o_get_object_attrib_value
Revise and cleanup libgeda::o_complex_check_symversion
Add change notifiers when traversing hierarchy
Update symbols in examples where applicable
Put back some old transistor symbols for backwards compatibility
Minor revision to in/out symbols, add type 3, symversion to 0.3
Revert input/output-?.sym Use "refdes=INPUT/OUTPUT" again
Add capacitor-2.sym symbol back for backwards compatibility
Update several symbols in gTAG example suppress warning messages