add output tag to distinguish BD from ID
add output tag to distinguish BD from ID

When using mBDI output files are named by “BD” or “ID” depending on the
model. If using fixed number of shifts (-A 0 or 1 -mL <number> -mM
<number>) those numbers are added to the output file names.

dsilvestro/PyRate,dsilvestro/PyRate,dsilvestro/PyRate,dsilvestro/PyRate