scripts/*.sh.in: Clean up and fix a few bugs

	repo-add, repo-remove:
		'bsdtar -c * | ...' doesn't work (you need '-f -'). Code clean up
		eliminated this bug.

		Removed the multiple checksum support, pacman now only supports MD5, so
		there's no need for the database to contain multiple checksums.

		Quote all variables containing file/dir names to prevent paths
		containing spaces from causing problems.

		Add msg, warning and error functions.

		General code clean up.

	pacman-optimize:
		Use a sub-directory in /tmp for working files to make it easier to clean
		up at the end.

		Add quotes round $@ in die and die_r, otherwise printf can't display the
		message correctly.

	makepkg:
		Disable colour output if stderr is not a tty.

Signed-off-by: Andrew Fyfe <andrew@neptune-one.net>

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