Properly process requested number of singular values when reading an svdim archive
Refactor parsing of command line options for num sing vals
Comply with rubocop, change accidental cammelcase name to snakecase, bump version.
Refactor code in preparation for handling color images
Extract extension swap method
Support color images
Refactor serialization of channels
Support converting all the files in a directory
Fork processing of images in a directory to speedup processing by the factor of cores available
Update help menu.
Allow reading directories of archived image_svd files