More tests for multi-table-update & timestamp handling

New (simpler) internal timestamp handling.
More debuging to heap tables.
Small cleanups to multi-table-delete
false -> 0 and true -> 1  (We should use TRUE and FALSE)

Add support for LIMIT # OFFSET #
Changed lock handling:  Now all locks should be stored in TABLE_LIST instead of passed to functions.
Don't call query_cache_invalidate() twice in some cases
mysql_change_user() now clears states to be equal to close + connect.
Fixed a bug with multi-table-update and multi-table-delete when used with LOCK TABLES
Fixed a bug with replicate-do and UPDATE

changed in table initialization

Still not able to make a proper test case as this crashes on files 
where key and data pointers are 4 bytes each. Possibly a proper 
test case would require myisampack.

memory corruption I can only repeat on one system.

* multi-table updates
* new paid feature for limiting number of queries per hour for users
* optional syntax for multi-table deletes
* optimization for SQL_CALC_FOUND_ROWS
* a small addition for CREATE .. SELECT that will be of future use

I know that all this will require many additions to documentation, 
which I have not done, but I am at Arjen's disposal to help him document
all this.

    added support for quiet
    increased line buffer size
client/mysqltest.c
    fixed memory leak
    added query logging to result file
    added error message logging to result file
    added enable_query_log/disable_query_log
mysql-test/mysql-test-run.sh
    converted tests to use mysqlmanager

Updated test results

Optimize fixed length MyISAM rows to use pread/pwrite.

added multi-delete test case that does not work - something for Sinisa to fix