Add HardRetab(), remove ssh_key_transfer, fix b...

Add:
	vimrc
		-add HardRetab() function, to mimic `retab` only for soft/hard tabs at
		the beginning of a line (ie, before any non-whitespace characters).

	vim/ftplugin/c.vim
		-replace _cFunction regex with a simpler, less parsing intensive one.
		-mod _constant to match single-character constants.

Fix:
	shell_scripts/bbsync.zsh
		-the script wouldn't actually exit if the BlackBerry wasn't connected;
		rectify.
Rem:
	shell_scripts/ssh_key_transfer.zsh
		-a utility for this exact purpose, `ssh-copy-id`, already exists.