This tool can:
  - screenscrape the commodities trading screen
  - produce the results as a tab separated values file
  - **TODO** upload the results to PCTB

To run it, change to this directory, type `make', and then:
  ./ypp-commodities --tsv >commods.tsv

It may put up a window asking about characters it does not understand.
It is important to get these inputs right or it may misrecognise
things in future.  **TODO** write actual useful instructuions to cover the
subtleties.  The results are stored in the file `charset-15.txt'.

If you need to report a bug, please be sure to remember the exact
error message and circumstances.  Also, for recognition problems there
will probably be a very useful screenshot file called `#pages#.pnm'.
This is likely to be very large so don't just email it to me, but if
you can put it up on a webpage for me to download that will help.

Options available:

 Setting the operation mode:
   --find-window-only       Just check that we can find the YPP client window.
   --screenshot-only        Page through and take screenshots, do not OCR
   --analyse-only | --same  Process previously taken screenshots
   --everything (default)   Take screenshots and process them

 Options to vary the processing:
   --single-page         One screenful, no paging - results will be incomplete
   --quiet               Suppress progress messages
   --screenshot-file F   Store or read screenshots in F rather than #pages#.pnm
   --window-id ID        Specified X window is the YPP client - do not search

 Setting the output processing:
   --raw-tsv          Dump the raw not deduped unsorted OCR'd data
   --upload (default) Upload to the PCTB server
   --tsv              Print data as clean tab-separated-values file
   --best-prices      Print best buy and sell price for each commodity
   --arbitrage        Print arbitrage opportunityes