Bugfix in FUGUE and doctest added

FUGUE interface was adding wrong parameter in forward warping mode.
Added the missing doctest of the interface.
Fix incorrect requirement of FUGUE input
Run make specs to fix auto test
Added interface to FSL fnirtfileutils
Updated CHANGES
Add ConvertWarp interface
Updated CHANGES
Fixed param in ConvertWarp that differs from website
ConvertWarp - mandatory inputs are positional
Now using name_source etc., both new interfaces
fixed doctests, now with name_source are they different?
Fixed doctest, extra char in expected string
Merge branch 'fix/FugueInterface' into bug/fixFUGUEsettings
FUGUE interface refactored.

Deeply reviewed the interface to use the new name_template system,
along with the correction of several issues. Also includes changes
of another PR, so close #856.
Fixed doctests. Fixed fsl.epi workflow.

The workflow was using an input with its name changed.
Fixed doctest
Added requirements of interface.

Also replaced the name_source dynamic setting with str instead of lists,
as it seems to produce errors when executing as MapNode of workflows.
Removed requires as it breaks doctests
Fixed some (too) long logical statements to agree with PEP8
Still having problems when running fugue inside a mapnode