tokutek/ft-engine#122 force all mysql tests to set a new tokudb session variable to hide the default compression

#122 change default compression to zlib and add a session variable to control create info row format

Merge branch 'loadermem80'

tokutek/ft-index#80 tokutek/ft-engine#94 add tokudb_loader_memory_size system variable that controls the size of each loader memory size

tokutek/ft-engine#111 tokutek/ft-index#74 merge the tokumx error message for transparent huge pages into tokudb

#92 use parent txn in ::delete_or_rename_table.  this removes error messages when running dict_leak_3518 test