muse.py needs os.symlink change

in muse.py, line 139:
`os.symlink(args.D,new_dbsnp)`
should be
`os.symlink(os.path.abspath(args.D),new_dbsnp)`

Otherwise the -D input (dbsnp.vcf) must contain a full path, which is confusing (since the bam files do not need this)
