xmlCleanupParser is dangerous and shouldn't be called in most cases.
Being part of the examples led many people to use it incorrectly.
xmlMemoryDump is an obsolete way to test for memory leaks.
There's no simple way to make the doc/examples tests handle different
configurations. But these tests aren't especially valuable, so remove
the result file checks.
* xmlschemas.c, xmlwriter.c, doc/examples/parse4.c,
doc/examples/io2.c: minor warning cleanup (no change to logic)
* xinclude: fixed return value for internal function
xmlXIncludeLoadFallback (now always 0 or -1)