[libxml++] Error Checking in parsers

[Christophe de VIENNE <cdevienne alphacent com>]

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I think we need to implement something a bit more clean and solid for checking 
errors after a parsing.

We already have a common function check_for_exception() which check for 
validity errors only.
I propose to make it check it _context->errNo, so any error libxml could 
report we catch it.
Since the errNo an int, I propose to modify parse_error class to take a libxml 
error number as a parameter in the constructor.

Comments/remarks welcome,

Christophe
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