Support error selection via prefix codes

[charliermarsh]

E.g., you should be able to --select D to enable all of the pydocstyle rules.

[matteosantama]

My concern with this is that numpy and google convention are surely the most common pydocstyle settings, and I'm not sure if --select D would make using those two any easier.

For example, to turn on convention=numpy, would you do --select D --exclude ... and list out all the codes you don't want? But then you start running into precedence issues, ie. should select or exclude take precedence?

[charliermarsh]

Alternatively, we could support a --docstring-convention=... setting that effectively adds the right codes to --select? Also interesting could be something more general that looks more like ESLint's system of "configs" (where each "config" turns on a set of error codes).

But then you start running into precedence issues, ie. should select or exclude take precedence?

(Yeah, the point totally stands but FWIW we've already defined this such that --ignore takes precedence over --select.)

[charliermarsh]

Oh, I'm actually going to close this as a duplicate of #325. That's my bad. We can continue discussion in there.