Parsing only needed params from sirmordred config file

[alpgarcia]

Manuscripts parses mordred config files including params it won't use. It should parse only those params needed to run manuscripts, and not everything else. Right now, if a new param appears in Mordred, manuscripts will break as it happened in #96.

To improve and ease code maintainability, additions or changes in mordred configs should not break manuscripts if they does not affect to the params used here.

[jgbarah]

I think mordred should have a option, such as --report or --manuscripts, to run manuscripts (via calling its API), instead of manuscripts parsing mordred config file.