ENH: added 'hsvs' option to 5ttgen + mrtransform fix

[teanijarv]

• added Hybrid Surface and Volume Segmentation ('hsvs') option to the 5TT image generation class
• removed the in_file existing requirement (exists=True -> exists=False) for 5ttgen because hsvs requires a directory not a file as input
• changed '-inverse' parameter location from 1 to 2 in mrtransform class (to make it possible to insert it in the command together with other parameters)

[effigies]

So it seems like you need either a file or a directory, not a missing file.

in_file = traits.Either( File(exists=True), Directory(exists=True), argstr="%s", mandatory=True, position=-2, desc="input image / directory" ) 

[teanijarv]

Thanks! I added this solution now. :)

[effigies]

This means -invert will appear after all of the things with position=1. Does it need to come last, before in_files/out_file?

[teanijarv]

I removed the position change for now, but I just added this previously because if I wanted to use -inverse with some other parameter and they both had 'position=1' then only one would show up on the command. But it can also be fixed by just using inputs.args string.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.15%. Comparing base (42302ed) to head (7fc44fd).
Report is 7 commits behind head on master.

Additional details and impacted files

@@ Coverage Diff @@ ## master #3630 +/- ## ======================================= Coverage 63.15% 63.15% ======================================= Files 308 308 Lines 40825 40825 Branches 5656 5656 ======================================= Hits 25781 25781 Misses 14031 14031 Partials 1013 1013 

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