New format for score sheet files (.scr)

.scr files are now simply a pprint'ed list of dictionaries. Though not so human
readable, the parsing is much simplified. All entries (dictionaries) include the
keys 'name', 'totscore' and one or more 'loc_XX' where XX are strings
representing organisms. Additional keys are the keys of the fdict function
dictionary specified in the criteria file.

Example files have been updated accordingly.