patch from devel; add two nonstandard seasons
patch from devel branch: simplify command-line usage by using path2,filter2 options; and not using
new_filter option, a default path, etc. any more.  Also, it uses the seasons options now.
patch from devel branch: add path2,filter2,new_filter options.  new_filter already is
obsolete, but I'll leave it in for now.