Fix version checks

[dweindl]

Add function for parsing version numbers. Update checks.

Fixes #349.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 70.96774% with 9 lines in your changes missing coverage. Please review.

Project coverage is 74.64%. Comparing base (9f11e73) to head (aee4707).

Files with missing lines	Patch %	Lines
petab/versions.py	75.00%	4 Missing and 1 partial ⚠️
petab/v1/problem.py	40.00%	0 Missing and 3 partials ⚠️
petab/v2/problem.py	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #350      +/-   ##
===========================================
+ Coverage    74.61%   74.64%   +0.02%     
===========================================
  Files           56       56              
  Lines         5571     5589      +18     
  Branches       978      980       +2     
===========================================
+ Hits          4157     4172      +15     
- Misses        1041     1043       +2     
- Partials       373      374       +1     

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