WIP - a branch with multiple commits for MF-AIX

[lefessan]

This branch started as a merge of some other branches for MF-AIX, and then some other commits were added:

• Make DOT optional after data descriptions by changing the heuristic to discriminate between LITERAL and LEVEL_NUMBER
• Allow extra DOT between data descriptions

All these commits should probably be submitted through separate pull requests.

[GitMensch]

Just a note: Instead of eprintf_token you want to use the (oboslete) %token-table.

You may also want to have a look at https://www.gnu.org/software/bison/manual/html_node/Enabling-Traces.html (though this is not related to your scanner change),

[GitMensch]

I highly encourage you to add test cases for what you want to achieve up-front.

This does not only help to validate fast and have the tests "nearly ready" [you may want to adjust them during development}, but also is extra useful if someone has a look at the WIP changes to see its purpose.