#20 Allow arbitrary separator for hash output

[Bit Weasil]

Both for the stdout output and for the file output, allow the specification of an arbitrary non-':' separator. Tab may be the preferred separator, but allow any arbitrary character to be chosen. Please add this functionality to the base hashfile header/class, and implement it in all the derived classes. The default should remain the colon, but update things to allow other if specified. If you're comfortable extending the command line class, do so, else bitweasil will handle this. It should probably involve a numeric value to allow non-printable characters to be specified.