mysql-test/r/archive.result:
  Adding test case for data directory support in create table.
mysql-test/t/archive.test:
  Added test for "data directory" support in archive.
sql/ha_archive.cc:
  Updated comments, added printable bits for support of "data directory"
sql/ha_archive.h:
  Added real_path to share (will come in handy in later code)