1. The script API "map_file" attribute has been changed
to accept and supply nil (for no file), a string (for
a file, empty is equivalent to "no file") and a list
for multiple files which are merged. The split at "+"
or "," has been dropped.
2. The strm* tools option ("--lefdef-map") has been changed
to allow multiple occurances instead of split at "+" or ",".