tags: add tag support

[sondove]

This adds support for tags in python code and cli

[sondove]

This is based on #117 so probably a good idea to merge that first

[myme]

This is based on #117 so probably a good idea to merge that first

It would've been good for this to be stacked by targeting #117, because the diff on this PR includes also all of those changes and it makes it a bit more difficult to distinguish between the changes. But seems like this doesn't really work with branches in remote forks. At least I'm not able to change the base to the 117 branch 👎

[sondove]

This is based on #117 so probably a good idea to merge that first

It would've been good for this to be stacked by targeting #117, because the diff on this PR includes also all of those changes and it makes it a bit more difficult to distinguish between the changes. But seems like this doesn't really work with branches in remote forks. At least I'm not able to change the base to the 117 branch 👎

I did target that branch when I made it. But let me try and change

[myme]

Looks good 🏷️

One comment is I tried to set multiple tags in one go, and it seems to only set the last -t argument:

Tried also with novem -p test-plot -t +foo -t +bar -C.

I think supporting multiple tags either through --append or some separator character would serve a nice use-case.

[sondove]

Looks good 🏷️

One comment is I tried to set multiple tags in one go, and it seems to only set the last -t argument:

I've added support for comma separated tag lists