Very huge patch with main irework for libxml 2.x for simplify all (patch takes

Very huge patch with main irework for libxml 2.x for simplify all (patch takes
~330KB):
- remove all silly versioning,
- make am/ac better uses standards,
- move all libxml files to libxml subdirectory,
- simplify detecting and using libz.

With using this patch porting all applications to using libxml 2.x will
much more simpler and in next move I'll try to prepare neccessary patches
for using this simplified version libxml.

Changed files:
    libxml-remake.patch -> 1.1