[FIX] Decoding ontology in PeptideIdentification df conversion

[axelwalter]

Function peptide_identifications_to_df() crashed when decode_ontology was set False. Because meta values were not decoded to strings, checking meta values in the CV failed when calling startswith().

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[timosachsenberg]

there seem to be a merge conflict.
can you add a simple test with / without decoding ontology?

[timosachsenberg]

Would be good to have a test that rötestes the ontology decoding. Will merge this as a bugfix