Added :group attribute to defface's to get the byte-compiler to stop
complaining.
Fixed some issues with process buffer not being killed along with the
source buffer, and fixed the refontify timer from firing after the
buffer is killed.

Also replaced a loop w/ `append' with `nconc' and tried to profile -
but the difference doesn't look that big.  Left the old commented-out
incase I get adventurous for testing more.