Implement relocation table RLE compression.

Makefile:
	add -R (RLE compression) to reloc.pl (saves almost 500 bytes).

bootloader/sector1.s:
	implement handling RLE compression in delta-compressed relocation
	tables.

util/reloc.pl:
	implement RLE encoding, with/without a length lookup table.

	The formatting in this commit is done so as to make the diff
	more obvious. Refactoring will occur in a future commit.

	Add POD documentation.