Fix fulldiag_evaluate help and license output (fixes bug #128)

[skilledwolf]

Summary

• add working --help/-h and --license/-l options
• print the standard ALPS copyright and license information
• report malformed options cleanly while preserving generic --NAME value parameters
• add focused CTest coverage for help, license, and no-argument behavior

Testing

• cmake --build --preset default --target fulldiag_evaluate --parallel 4
• ctest --test-dir build/default --output-on-failure -R ^fulldiag_evaluate

Closes #128

[egull]

Looks good, thanks!

[skilledwolf]

@marcusr2ML do you have some capacity to take a look at this? it's just a a few lines of code to review -- it fixes how the command line arguments are parsed and prints license information.

[marcusr2ML]

Sorry, missed this.