Allow specifying `index_column_name` without `config.yaml` about eido HOT 4 CLOSED

Actually I didn't know that eido provides positional --st-index argument which actually solves the problem (facepalm).

Ok, great.

Another option is to change to:

1. Value specified in Project constructor
2. Value specified in Config
3. Default value (sample_name)
4. If no match, use the first column

The schema specification doesn't make sense, because it would make the peppy Project constructor rely on the schema. You can, of course, get the value from the schema yourself, and then just pass it to the project constructor. But don't make peppy require a schema for creating a Project.

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@nsheff can I have your comment here? Which option looks better for you?

Also @nleroy917 @khoroshevskyi I would love to hear what do you think.

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Actually I didn't know that eido provides positional --st-index argument which actually solves the problem (facepalm).

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then the only way to specify this and allow correct validation from command line is to have config.yaml defining new sample table index column name.

Not exactly. Another way is to just pass the name of the index column as a command-line argument. Another way is to assume that the first column is the index column.

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