cleanup: monsterously huge whitespace cleanup, git pre-commit hook.

cleanup: monsterously huge whitespace cleanup, git pre-commit hook.

From this point on, please configure your editor to
  - use spaces instead of tabs
  - warn about (or colorize) whitespace errors (tabs, trailing
    whitespace, emply line with whitespace, etc.)

Also after having clones/pulled this update, please run a
'make install-git-hooks' at the top level directory. This will
install a custom pre-commit hook that prevents subsequent
commits that would accidentially introduce whitespace errors.