libxml2 -- multiple vulnerabilities

Daniel Veillard reports:

More format string warnings with possible format string
vulnerability (David Kilzer)
Avoid building recursive entities (Daniel Veillard)
Heap-based buffer overread in htmlCurrentChar (Pranjal Jumde)
Heap-based buffer-underreads due to xmlParseName (David Kilzer)
Heap use-after-free in xmlSAX2AttributeNs (Pranjal Jumde)
Heap use-after-free in htmlParsePubidLiteral and
htmlParseSystemiteral (Pranjal Jumde)
Fix some format string warnings with possible format string
vulnerability (David Kilzer)
Detect change of encoding when parsing HTML names (Hugh Davenport)
Fix inappropriate fetch of entities content (Daniel Veillard)
Bug 759398: Heap use-after-free in xmlDictComputeFastKey
(Pranjal Jumde)
Bug 758605: Heap-based buffer overread in xmlDictAddString
(Pranjal Jumde)
Bug 758588: Heap-based buffer overread in
xmlParserPrintFileContextInternal (David Kilzer)
Bug 757711: heap-buffer-overflow in xmlFAParsePosCharGroup
(Pranjal Jumde)
Add missing increments of recursion depth counter to XML parser.
(Peter Simons)
Fix NULL pointer deref in XPointer range-to