clean up
bugfix.
use canonical paths. Before getRelativePath(".", "/path/./dir/") didn't
work when "/path/" was the current directory.
ImagePlus export: added dialog for choosing output path, resolutions, etc.
ImagePlus export: export 4D/5D stacks (multi-channel and/ or timelapse)
disable min/max fields unless minMaxOption "Use values specified below" is selected.
Update help text (shortcuts for moving in time).