Update homepage URL in gschem about dialog.
libgeda: Fix typo in o_pin_update_whichend

Example symbol reproducing the bug:
v 20020825
P 305 0 305 100 1
P 305 200 305 300 1
libgeda: Remove dead code

The bounding box of a pin has PIN_WIDTH_NET / 2 extra space in all
directions (see world_get_line_bounds in o_line_basic.c).