Id should work locally as well

[lsrdg]

The id command currently opens a browser on the sentence page (by id-number). And that's ok.

However, the "track sentences by id number" should also work locally. That would also open up the path to other levels of relationship between the data.

Some ideas:

• id becomes a flag to be used (with other commands)
• id can also be a function returning a list or a dictionary will a sentence's data.
• id command accepts a flag that defines where should it look for the sentence (local/remote)

Marked as a "bug" since Tatoeba-karini should be as effective without internet as it is with connection.