Fix issue with twolf where the presence or absence of two files, smred.sav or smred...

Fix issue with twolf where the presence or absence of two files, smred.sav or smred.sv2, would affect the outcome of the program. These names are based on the input file names which are in turn based on the input set selected. There may be more files like this generated for larger input sets, for example "mdred.sv3"

--HG--
extra : convert_revision : f4f1d3fd0fb28468b0ee507aaadf3c14aa9cf924