* add xmlErrorGetColumnNo to get the column number of the syntax error
* pass an error at a higher level to lower levels
* detect a number of extra syntax errors
sequence could give a false negative result
* Add a 'clear' attribute to the xmlErrorGet functions that indicates whether
the error should be cleared or not
* detect more xml syntax errors
for thread safety under windows
* Add xmlErrorGetString, xmlErrorGetLineNo for syntax error detetction
* Add xmlErrGetNo for detection of, and clearing the last error
* likewise for xmlCopyNode en xmlCompareNode
* add xmlAttributeGetDouble, xmlAttributeGetInt, xmlAttributeGetString
xmlAttributeCopyString and xmlAttributeCompareString functions
* fix some small bugs and problems along the way
* add support for filtering on attribute value in xmlgrep
* fix a problem where the wrong node-name length was returned
* xmlgrep now also works when only the -e options is specified
* fix xmlgrep to show the correct node-name (it reported the parent
node-name in the previous version)
