better css3 support
Much better css3 support inluding :not pseudo-class and other 
pseudo-classes, like :lang, :empty, :root, :nth-child, and so on.
renamed tidy to small_tidy
some small fixes
improved css3 support - implemented all css3 methods
insertAfter's bug fixed
small fixes
bugfixes
fixed new loop method - loop and small getnode bugfixes
small nth-* improvement
added parameter to loop
eliminating warnings
Xt is now compatible with E_ALL | E_STRICT error_reporting level
load - protected to public
new function - clone