Use name_source in ConcatenateLTA

[oesteban]

Adds name_source to the out_file input of ConcatenateLTA.

[effigies]

Looks okay.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@66411f4). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #2237   +/-   ##
=========================================
  Coverage          ?   72.31%           
=========================================
  Files             ?     1182           
  Lines             ?    58942           
  Branches          ?     8490           
=========================================
  Hits              ?    42625           
  Misses            ?    14933           
  Partials          ?     1384

Flag	Coverage Δ
#smoketests	72.31% <ø> (?)
#unittests	69.88% <ø> (?)

Impacted Files	Coverage Δ
nipype/interfaces/freesurfer/preprocess.py	65.81% <ø> (ø)
...faces/freesurfer/tests/test_auto_ConcatenateLTA.py	85.71% <ø> (ø)

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