mark big_tables deprecated, the server can put temp tables on disk
as needed avoiding "table full" errors.
in case someone would really need to force a tmp table to be created
on disk from the start and for testing allow tmp_memory_table_size
to be set to 0.
fix tests to use that instead (and add a test that it actually
works).
make sure in-memory TREE size limit is never 0 (it's [ab]using
tmp_memory_table_size at the moment)
remove few sys_vars.*_basic tests
