Add parameter for minimal and maximal altitudes

[tgross03]

Added min_alt and max_alt parameters to be able to adapt to simulation or telescope altitude restrictions.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 33.33333% with 8 lines in your changes missing coverage. Please review.

Project coverage is 55.14%. Comparing base (b65e290) to head (16da50b).

Files with missing lines	Patch %	Lines
radiotools/visibility/visibility.py	33.33%	3 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #15      +/-   ##
==========================================
- Coverage   55.55%   55.14%   -0.41%     
==========================================
  Files          14       14              
  Lines         594      602       +8     
  Branches       60       63       +3     
==========================================
+ Hits          330      332       +2     
- Misses        253      256       +3     
- Partials       11       14       +3     

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[aknierim]

Approved, but could you also add tests?

[tgross03]

Approved, but could you also add tests?

Yeah, should be no problem. Will be on my to-do list.