cleanup common code

remove code no longer needed
fix format Output property

use xmlInitParser instead of xmlInitThreads
reentrant safe as well no need for xml_parser_inited

fix xml_parser_inited on win32
add common structs for better interoprability

updating license information in the headers.

implmentation of document ref counting for persistance
re-work of internal object handling

fix more memory overruns
initial definition for document ref counting
fixed property access to support all objects
clear property handler from invalid objects until ref count implemented

Missing header

Inital cut of new dom extension
PHP5 only