patches to allow HASH_BITS > 15

[John Reiser]

In gzip I want to try HASH_BITS greater than 15, but deflate.c interferes:
   #if HASH_BITS > BITS-1
      error: cannot overlay head with tab_prefix1

Investigation shows that the data space for LZW compress acts as the master,
with zip deflate being a slave whose arrays never can be larger.

Attached are two patches which make the two sides more equal.
The first patch prepares the way by renaming BITS to LZW_BITS
and creating new header file deflate.h similar to lzw.h.
The second patch uses MAX() when overlaying arrays, which allows
either to be larger.  (Beware 'sizeof' any previous master.)

Now I can vary HASH_BITS and LZW_BITS independently.

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0001-Prepare-to-overlay-arrays-in-either-order-zip-deflat.patch
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0002-Use-MAX-for-array-overlays.-Prefer-prev-head-window-.patch
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