Create growingrecs.py

[fhocutt]

Command-line tool to find the most common planting conditions for a given crop. This version counts combinations of planted_from and sunniness, but as planted_from is often left blank this may not be the best choice.

[Skud]

BSD license was what I chose for the github repo. It might be good for us to develop some suitable boilerplate to go at the top of each script, with links to the github, license, and other info. Not urgent, just a thought.

[Skud]

This is a great start :)

I'll leave some line-by-line comments but also a few general ones.

Firstly, I think we should create subdirs, v0 and v1, for different API versions, and put this (along with other scripts with this API) in the v0 directory.

Secondly, I think it would be useful to name scripts starting with, say, the main object in the database we're dealing with. It might make it easier for people to find examples of what they're looking for. So this for example would be crop_growing_recs.py or maybe crop_growing_advice.py ("growing advice" being the term we more commonly use in the project).

You asked me to comment on the level of internal documentation/comments and I'll do so inline, but overall it looks pretty good and and the code+comments together are quite clear to me -- and I don't particularly speak Python :)