Issue 351: MySQL mode: can not create a table with the column "KEY", and can not open databases where such a table already exists. (KEY is _not_ a keyword.)

Issue 351: MySQL mode: can not create a table with the column "KEY", and can not open databases where such a table already exists. (KEY is now a keyword.)

TCP Server: a base directory with a prefix with a database name with prefix didn't work as expected (this only applies to non-disk and wrapped file systems).