Bugfix in FUGUE and doctest added

FUGUE interface was adding wrong parameter in forward warping mode.
Added the missing doctest of the interface.
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.