Log Message:
(math/R-XML) Updated 3.99.0.14 to 3.99.0.16.1

============ entries from CRAN ============
Version 3.99-0.16.1

	Changes for libxml2 >= 2.11.0, in src/DocParse.c and src/XMLEventParse.c

Version 3.99-0.16

	Avoid prntf-like warnings
	Rd markup

Version 3.99-0.15

	Complete stub in LICENSE file.

Version 3.99-0.14
	remove unexported generic append()
	update URLs