More than one source in a dataset

[mikapfl]

Pull request

Please confirm that this pull request has done the following:

• Tests added
• Documentation added (where applicable)
• Description in CHANGELOG.rst added

Description

Allow for more than one source in a dataset.

[codecov]

Codecov Report

Merging #17 (12f56f0) into main (5d49d29) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #17      +/-   ##
==========================================
- Coverage   99.46%   99.45%   -0.02%     
==========================================
  Files          21       21              
  Lines        1318     1292      -26     
==========================================
- Hits         1311     1285      -26     
  Misses          7        7              

Impacted Files	Coverage Δ
primap2/_data_format.py	98.80% <ø> (-0.03%)	⬇️
primap2/_metadata.py	100.00% <ø> (ø)
primap2/tests/examples.py	100.00% <ø> (ø)
primap2/tests/test_metadata.py	100.00% <ø> (ø)
primap2/tests/test_data_format.py	100.00% <100.00%> (ø)

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