Adding stuff to make it easier to set up the mysql user.

	modified:   INSTALL-MYSQL
	new file:   scripts/setup-mysql.txt
Removing accidentally duplicated variables in child class.

	modified:   implementations/mysql_world_model.hpp
Minor aesthetic changes.
Fixing test (forgot to account for sleep time in standing query thread)

	modified:   implementations/mysql_world_model.cpp
	modified:   libwm/src/standing_query.cpp
	modified:   tests/src/test_world_model.cpp