gEDA-dev: New page hook

[Carlos Nieves Ónega]

Hi all,
I have just checked into CVS some changes, adding a new page hook to
gschem, and an add-component function for scheme.

The latter adds a component to a schematic at a given (x,y) position.

This way, a titleblock can be added automatically when a new page is
created, and gschem's view won't be so zoomed out (a zoom extents is
done afterwards).

I also placed some lines into the system-gschemrc file (commented out by
default) to show this new feature.

Comments welcome!

Carlos