Switch to Multiformat Reader - Witec and ROD

[RonHildebrandt]

Somehow, something unknown broke the the CI/CD broke with the first PR version. Here a new PR:

First version to add the Raman Open Database File reader.

Tasks

• assign all fields via config file
• generalize reader to work with all present example (witec .yaml+.txt AND .rod file)
• figure out fields, which can not be directly assigned - take a look into ROD documentation | Some information can be found in the README file for the .rod example.
• Make Issue to remove the assignment of "single-channel" for the "detector_channel_type" in NXoptical_spectroscopy avoid pytest warnings. This requirement will be relaxed, as this will be relaxed later in the nexus definitions

[RonHildebrandt]

I want to update later the .rod file parser, to include all available meta data - with a seperate PR.

[RonHildebrandt]

I have now included the config files as well wihtin the tests. Would be better if they are only at one location.

Maybe I can remove then the config folder in source? As this config file is spcified for the respective example, it may be better to place it there?

[lukaspie]

I have now included the config files as well wihtin the tests. Would be better if they are only at one location.

Maybe I can remove then the config folder in source? As this config file is spcified for the respective example, it may be better to place it there?

The point of having it in src/ is that you don't need to always use it as an input file to the reader. If you remove it from there, you e.g. always have to drop it to NOMAD. I thought the rod data has always the same structure? Then it makes sense to have a config as default. You can always drop another config file that takes priority over the default.

By the way, when I remove the config file in tests/data/rod, the tests still work. But not so for removing it from tests/data/witec

[RonHildebrandt]

@lukaspie
"The point of having it in src/ is that you don't need to always use it as an input file to the reader. If you remove it from there, you e.g. always have to drop it to NOMAD. I thought the rod data has always the same structure? Then it makes sense to have a config as default. You can always drop another config file that takes priority over the default."
Ah alrigtht. Then I want to keep it that way. Sounds legit.

"By the way, when I remove the config file in tests/data/rod, the tests still work. But not so for removing it from tests/data/witec"

Hm okay? Ill try to take a look into it. Weird.
UPDATE. Okay found it. Adjusted the witec code and removed all other not needed config files.

[lukaspie]

Left some comments here and there, but overall looks okay for me now. Please also update the name and description of the PR for future reference.