Enable passthrough of DeepLC options in fasta2speclib

[RalfG]

To enable DeepLC calibration and other DeepLC options in fasta2speclib, the fasta2speclib config (from json file) should be passed to the ms2pip.retention_time module:

Replace this line: https://github.com/compomics/ms2pip_c/blob/2e0c2af34d9d81317a5313b837d9d4111a96981f/fasta2speclib/fasta2speclib.py#L342

With

        rt_predictor = RetentionTime(config=params)

This makes it possible to add a deeplc entry to the fasta2speclib config file:

{
    ...
    "elude_model_file":null,
    "rt_predictions_file":null,
    "add_retention_time":true,
    "deeplc": {
        "calibration_file": "/path/to/deeplc/peptide/file.csv"
    }
}

Other options under “deeplc" could be any option from the DeepLC API.

[RalfG]

Was already fixed in #135.