Small fixes

[keurfonluu]

• Fixed: allow more than 5 USERX values.
• Fixed: force a white space after the end of TIMBC block (it seems that it is required despite the user guide saying otherwise).

Reminders:

• Run invoke format to make sure the code follows the style guide,
• Add tests for new features or tests that would have caught the bug that you're fixing,
• Write detailed docstrings for all functions, classes and/or methods,
• If adding new functionality, unit test it and add it to the documentation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.21%. Comparing base (00363f6) to head (ff69fc5).
Report is 14 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #166      +/-   ##
==========================================
- Coverage   90.21%   90.21%   -0.01%     
==========================================
  Files          97       97              
  Lines        6284     6283       -1     
==========================================
- Hits         5669     5668       -1     
  Misses        615      615              

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