fix: updated transforms
Merge remote-tracking branch 'upstream/master' into fix/ants

* upstream/master: (24 commits)
  added missing rst
  added custom filename support for workflow saving
  changelog
  Improved documentation
  Clearing out some debugging print code
  DOC: Function docs and CHANGES updates for external imports
  TEST: new tests for Function interface updates
  ENH: external import functionality in utility.Function and underlying support code
  Added optional config inclusion
  Changelog.
  Fixed tests.
  autopep8
  fsl invertwarp
  fix: nodenames in connect statement
  fix: node.name still being used
  fix: node.name still being used
  fix: node.name still being used
  fix: node names should reflect workflow heirarchy
  fix: datagrabber outfields
  fix: update a few more dynamic interfaces and allow for keyword arguments to be encoded
  ...
Fixed links.
More fixed links.
More doc fixes.
Merge remote-tracking branch 'upstream/master' into fix/ants

* upstream/master:
  fixed doctest
  Fixed package_check for dipy tensor mode interface
  Added Ennis citation to class documentation
  Updated CHANGES
  Documentation updates, PEP8, reworked output naming
  Updated Tensor Mode interface to use latest dipy tensor code
  Interface for 'Mode' of diffusion tensor maps
Updated numpydocs
enh: added sigma units
fix: turned sigma units into a list
fix: initial moving transform no longer uses default
fix: syntax error
fix: sigma units
fix: added argstr to trait
fix: initial transform name
fix: initial transform mapping
fix: commenting out collecting the initial transform for now
fix: output image names
fix: tests, absolute path on outputs
Added missing unit inputs.
make some ANTS inputs mandatory