Making BSD/GNU tag names mainlined

[dd86k]

Currently the --tag switch outputs OpenSSL compatible tag names like SHA2-512, but GNU coreutils and BSD utilities will use SHA512.

At least in v2.0.1-3-g93c8ed3, both styles in check files mode is supported, but otherwise only the OpenSSL style is used on output.

Though now the question is, do I only add --tag2 for BSD style or make --tag for BSD style and move OpenSSL to --tag2...

[dd86k]

On second thought:

• Most people use GNU coreutils and BSD utilities that offer the tag option
• Busybox environments such as Alpine Linux has no such option
• OpenSSL is not the only cryptography security provider out there, but seems to be the only one providing the command-line option to hash files

Therefore:

• ⚠️ The tag option will main the GNU/BSD way except for additional OpenSSL tag names
• Tag will stay named Tag but will accommodate GNU/BSD-styled tagnames
• Tag2 will be renamed OpenSSL Tag or just OpenSSL if it cannot be fitted in the column
• To avoid too many columns, additional tag names may collapse into Name
  • e.g., ripemd160 RIPEMD-160, RIPEMD160, RMD160

[dd86k]

Both GNU and BSD tag names are checked in ddgst 3.0. Uses BSD tag names for writing digests to stdout.