Fixed problems with original gzio() functions not being able to correctly return lengths of long rows. 


storage/archive/archive_test.c:
  Updated the test for 2gig and 4gig tests.
storage/archive/azio.c:
  Fixed return type bug that was inherited in original library.
storage/archive/azlib.h:
  Fixes for original library
storage/archive/ha_archive.cc:
  Far more error testing!
storage/archive/ha_archive.h:
  Updated returnn type for pack_row()