[12gevmoller_sim] [JeffersonLab/remoll] 531c9c: Add cmake option ADDITIONAL_FIELDS to download mor...

[Wouter Deconinck]

  Branch: refs/heads/feature-additional-fields
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  Commit: 531c9cb6d7666f2cf5615951f76ff59df758b3b1
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  Author: Wouter Deconinck <wdconinc at gmail.com>
  Date:   2019-03-22 (Fri, 22 Mar 2019)

  Changed paths:
    M CMakeLists.txt

  Log Message:
  -----------
  Add cmake option ADDITIONAL_FIELDS to download more fields

This addresses issue #221 by adding the following
```
cmake -DADDITIONAL_FIELDS=ON ..
```
which will download upstreamSymmetric_sensR_0.0.txt and
hybridSymmetric_sensR_0.0.txt into map_directory.

Tried to solve this by introducing a separate make target but this was
faster and ultimately equivalent in documentation requirements.