dqMetaInfo() - Fixed the error of "ASSERT “Cannot send events to objects owned by a different thread.”" on Windows.

A new slot called setParantToApp is added to prevent to call setParent() on different thread.
Refactor sqlitetests - Added AccessTests as a  parent of SqliteTests. It will shared with other backend engine testing program
Merge commit 'd81f6ad9053030e7f6' into v0.3

Conflicts:
	tests/sqlitetests/sqlitetests.pro
	tests/unittests/sqlitetests.cpp