* Separate common inlines and macros to deflate_p.h
* Separate deflate_fast related code to deflate_fast.c
* Separate deflate_medium related code to deflate_medium.c
* Separate deflate_slow related code to deflate_slow.c
From: Arjan van de Ven <arjan@linux.intel.com>
As the name suggests, the deflate_medium deflate strategy is designed
to provide an intermediate strategy between deflate_fast and deflate_slow.
After finding two adjacent matches, deflate_medium scans left from
the second match in order to determine whether a better match can be
formed.
Fixes#2
