Link modification dictionary with modifications from MzId

[rmylonas]

Should be easy to link with the Unimod AC.

[alexmasselot]

cool

[rmylonas]

When parsing a MzId we're still using the Unimod xml file provided by the MzJava library.
We should use the static setter available in the MzJava library to set it to our local Unimod file.