Lzh, compression

I once tried to compile a LZW unit from SWAG with FPC, and it compiled, but failed to work.

I put quite some time in debugging the unit, so I decided to stick it into FPC. Right now it's probably the same as in SWAG, since new compilers (read since august 98) don't have those bugs anymore, and the fixes are now unnecessary

In the future I hope to add some assembler to this unit to speed it up a bit. I also try to add some standard procedures to ease interfacing with this unit a bit

If you use a Lzw unit, I suggest you use this one. It's safe (there are three lzw units in SWAG, this is the only fully working one as far as I know)

If you want to work on the assembler optimalisations, please mail me, I've some old 8/16-bit asm-code lying around, which could be a starting point