modified during testing

!+1 makeThumbnails makes thumbnails of the specified files.

!-1 !+2 NOTE: incorrect!

!-2 !+3 makeThumbnails3 makes thumbnails of the specified files in parallel.

!-3 !+4 makeThumbnails4 makes thumbnails for the specified files in parallel. It returns an error if any step failed.

!-4 !+5 makeThumbnails5 makes thumbnails for the specified files in parallel. It returns the generated file names in an arbitrary order, or an error i

!-5 !+6 makeThumbnails6 makes thumbnails for each file received from the channel. It returns the number of bytes occupied by the files it creates.

f(x) = x^4 - 1 z' = z - f(z)/f'(z) = z - (z^4 - 1) / (4 * z^3) = z - (z - 1/z^3) / 4

!-exec

!+alt

!-parseAndCheck !+plot

search implements the /search URL endpoint.