Remove valgrind errors
make friend to class instead of class functions
Auto delete object collection on destructor
Test short hostname only (without domain name)
Delete instance of singleton
Test reset function. Delete instance of singleton
Move object pointer to protected class member. Add delete instance function. Add "is instancied" check function
instanciate log functions. Prepare function return member reference instead of static var. Debug database log engine.
Improve tests: DFactory, DLog DSingleton and DSqlite
Remove group feature. Var must be called by XPath.
Improve tests: DSettings