add toolbar item: prevent malformed help text from crashing Emacs
aquamacs-bugs: report lisp function when reporting crash
provide functions to extend region by mouse
mouse-sel is no longer included/provided (obsolete)
Cleanup of the main aquamacs.el package.

Whitespace, formatting, comments.
Removed commented-out code.

Only semantic change:
Remove long-deprecated mac-pass-option-to-system `defvar'.