Log Message:
update to 2.7.8
changes:
-add code to plug in ICU converters by default
-Add xmlSaveOption XML_SAVE_WSNONSIG
-documentation fixes
-portability fixes
-bugfixes, in particular for an XPath problem which can be exploited
 to crash the program by a malformed XPath expression (CVE-2010-4008)
-misc improvements, cleanup