* doc/Makefile.am: make the check for symbols pbm a make api failure
* doc/symbols.xml: added xmlXIncludeProcessTreeFlagsData
* doc//* elfgcchack.h libxml2.syms testapi.c: regenerated
* doc/symbols.xml: new global data xmlStructuredErrorContext
* doc/checkapisym.xsl: slightly improve output
* doc/* libxml2.syms win32/libxml2.def.src: regenerated the API
* doc/symbols.xml: the source for all exported symbols
* doc/checkapisym.xsl: used to check libxml2-api.xml against exported
symbols
* doc/syms.xsl: stylesheet regenerating libxml2.syms from symbols.xml
* doc/Makefile.am libxml2.syms: add the new rules and the generated
version
* libxml2.syms: the symbols with history, going back to 2.4.30
* Makefile.am configure.in: linking flags detection and use
* parser.c tree.c valid.c xpointer.c: various cleanup of functions
which could be made static or simply discarded, not that many
