just brought gzip stream package from pharo 1.4 into repository
hacks to get package to load into GemStone
move GZip classes fresh from Pharo1.4 into Core package
added GZip test classes from Pharo1.4 to Core package
Implement GZipReadStream and GZipWriteStream in support of Zinc

- reconstitue InflateStream and FastInflateStream to
  accommodate GZipReadStream
- add ZipCrcTests and ZipWriteStreamTests
- put the compression support classes into a separate
  package that is common for GemStone2.4 and
  GemStone3.x
- this commit is from a 3.1 stone (which is compatible
  with 3.2) ... need to finish up with updates to 2.4
  and 3.0.1
FastInflateStream needs to call super initialize..
rewrite GemStone2.4 version of Core package with compression classes moved to GemStone-Compression
_decompressZipArchive not available in GemStone2.4
add 3.2 to lineup