Fixed memory leaks.

Fixed memory leaks.

Fixed two memory leaks:
 - AnalysisData leaked memory if startData() was called more than once.
 - Memory for the error collector object in selection parser was not
   properly managed.  Now the object is no longer dynamically allocated,
   which is much cleaner.

Also added a call to xmlCleanupParser() at the end of tests to remove
static memory allocated by libxml2 from, e.g., valgrind reports.

Also added suppressions for legacy and external library code.

Change-Id: I3ec213b6441d38f46bda138c959dbb5990144027