xml_func.py: XML functions that assume their last argument is a value (_map, etc.): Use new helper function pop_value() to retrieve this value. Return None if value is None because this indicates the input is empty.

xml_func.py: _date: Use format.str2int instead of int to convert date parts to int so that strange formatting will be parsed correctly

format.py: clean_numeric(): Also fix some OCR errors

filter_errors: Default to outputing only the first match

xpath.py: Added append() to recursively append subpath to every leaf of a path tree. parse(): Use append() to fix bug in split path parsing where subpath was not added to every leaf of the tree, only the main leaf of the main branch and the main leaves of the other branches of the last element.

exc.py: Changed to store multiple tracebacks in an exception, in case an exception is caught and re-raised inside an ExceptionWithCause wrapper. This preserves more of the traceback in this situation, because you get the ExceptionWithCause's traceback as well.

input.Makefile: import: Removed verbose=1 because verbose mode is now automatically on (except in test mode)

bin/map: verbose mode defaults to off in test mode and on otherwise

bin/map: In verbose mode, print which input rows will be processed

bin/map: n option: Defaults to 1 in test mode. Empty string "" is interpreted as None (previously n would have to be unset to specify None).