use Category for main panel (default margin)
use CheckBox for auto apply / auto update
don't give strange progress 73/72 at the end
fix use of the panel as Qt widget parent & for closing

(fixup commit for 409b3f11073f141c9677d5b7542a1c152fab2869)
CLIImporter: expand ~ and MLAB variables in paths
use new autoDetermineDataType flag of itkImageFileReader
cleanups of comments and assertions

* voxel shift is fixed in MeVisLab now
* compression is probably irrelevant
* parameter.channel must be input/output,
  otherwise the rest of the code would not work
start generating .mhelp instead of .html (not finished yet)
also create mhelp directory
complete .mhelp generation

* more sections (mhelp parser does not like missing sections)
* windows section with screenshots (images not working yet)
* document fields, moving comments into .mhelp
* document debugging fields
reorder and update .mhelp tags

(the result should mimic what MeVisLab itself generates)
add bool option whether to generate screenshots
strip 'name' postfix from input image field names
add browse button for adding import paths
remove caveat about fixed itkImageFileReader bug
sanitize author names to reduce MeVisLab warnings