Added TOTP (6 digits) functionality to ykchalresp.c
Tab fixup
Added flag for 8 Digit TOTP
Refactoring TOTP/HOTP command line flags
Make -6 and -8 available for non time based HMACs
Bugfix: -Y should not work with -6 or -8
minor indentation fix
refuse challenge on command line if -t is given
man for recent totp additions to ykchalresp