Large speedup, especially when using innodb-flush-log-at-trx-commit = 2

Optimized the historic range request and snapshots and insertions.

Some cases still slow, but the common worst cases have been cleaned up.

	modified:   ../implementations/mysql_world_model.cpp
	modified:   proc/deleteAttribute.mysql
	modified:   proc/expireAttribute.mysql
	modified:   proc/updateAttribute.mysql
	new file:   table/CurrentAttributes.mysql
	modified:   ../tests/src/test_world_model.cpp