start switching is_set/set_bit/clear_bit calls to macros so only the compiler has to worry about bit widths
finish cleaning up set_bit/clear_bit
finish is_set() cleanup
fix idiotic --maf bug, now to find out when it crept it...
prevent --distance missing weight overflow
about to make --make-bed word-based
better --make-bed
remove duplicate --make-bed code
collapse_copy_phenod_incl bugfix
display correct FID/IID for --ibc