Add a heuristic check to fasload so that it won't get into an infinite

Add a heuristic check to fasload so that it won't get into an infinite
loop trying to load something when there is no space.

Merge in Mike Clarkson's changes to x11term.c

Add a new file: x11xtra.c which includes some additional x11 xterm
functionality (scrolling and screen saving/restoring).