Check pip requirements/dependencies

[howff]

Had to use pip install --prefer-binary because Guneet's Windows PC had some odd configuration which meant that pip was pulling in packages marked as pre-release, which were source-code only (no compiled binary package available yet) and a lack of a Windows compiler meant the packages could not be installed.

Cannot use --only-binary=:all: because things like pytesseract are only source (which is fine, doesn't need to be compiled).

However Daniyal has reported dependency problems with things like matplotlib, see https://git.ecdf.ed.ac.uk/SMI/service/-/issues/137#note_157855