Short: Dynamic Huffman xpk compression library

This  is  a  rewrite  of  xpkHUFF.library.   It's  100%  68000 and pc-relative &
reentrant.  And it's FAST, and when I say fast, I mean REALLY fast.  It is not a
replacement  for  HUFF  but  a further library called HFMN because the algorithm
used  is not 100% identical to the one of HUFF, therefore the HFMN data will not
decrunch with HUFF and vice versa.

signed 01-Nov-93 Martin Hauner