DNMY: Add support for the MOP file format

[odow]

This PR adds support for the MOP file format for multi-objective optimization.
See http://moplib.zib.de

It requires jump-dev/MathOptInterface.jl#968, so the Manifest is checked in for now.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@47390cd). Click here to learn what that means.
The diff coverage is 71.73%.

@@           Coverage Diff            @@
##             master     #95   +/-   ##
========================================
  Coverage          ?   95.6%           
========================================
  Files             ?      10           
  Lines             ?    1435           
  Branches          ?       0           
========================================
  Hits              ?    1372           
  Misses            ?      63           
  Partials          ?       0

Impacted Files	Coverage Δ
src/LP/LP.jl	96.51% <0%> (ø)
src/CBF/CBF.jl	98.98% <0%> (ø)
src/MathOptFormat.jl	95.65% <50%> (ø)
src/MPS/MPS.jl	96.33% <76.19%> (ø)

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