Reducing memory when using information schema
The background is that one user had a lot of views and using some complex queries on information schema temporary memory of more than 2G was used. - Added new element 'total_alloc' to MEM_ROOT for easier debugging. - Added MAX_MEMORY_USED to information_schema.processlist. - Added new status variable "Memory_used_initial" that shows how much MariaDB uses at startup. This gives the base value for "Memory_used". - Reuse memory continuously for information schema queries instead of only freeing memory at query end. Other things - Removed some not needed set_notnull() calls for not null columns.
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