renaming testCatalog as xmlcatalog, making it an installed app adding a

* Makefile.am xmlcatalog.c libxml.spec.in: renaming
  testCatalog as xmlcatalog, making it an installed app
  adding a shell, and preparing it to be a /etc/xml/catalog
  management tool, though not ready yet
* catalog.c include/libxml/catalog.h: adding support for
  XML Catalogs http://www.oasis-open.org/committees/entity/
  not finished, there is some interesting tradeoffs and a
  few open questions left.
Daniel
8 files changed