Introduce xmlStrVASPrintf, trying to handle buggy snprintf
implementations.
Introduce xmlSetError to set errors atomically.
Introduce xmlUpdateError to set an error, fixing up node, file and line.
Introduce helper function xmlRaiseMemoryError.
Make legacy error handlers call xmlReportError, avoiding checks in
xmlVRaiseError.
Remove fragile support for getting file and line info from XInclude
nodes.
Don't ignore malloc failures in xmlRaiseError and xmlCopyError.
Don't print filename if context has no input.
Introduce xmlVRaiseError taking a va_list.
Private functions were previously declared
- in header files in the root directory
- in public headers guarded with IN_LIBXML
- in libxml.h
- redundantly in source files that used them.
Consolidate all private header files in include/private.
