More indices to improve query speeds

[talavis]

Describe the pull request:

• Bug fix
• Functional change
• New feature
• Code cleanup
• Build system change
• Documentation change
• Language translation

Pull request long description:

More indices to improve the query speeds. The one affecting data.features improves the query speed for the top part of e.g. transcripts a lot.

[talavis]

CREATE INDEX features_transcript_type ON data.features (transcript, feature_type); is the only one that leads to a very notable improvement.

[viklund]

But the other ones lead to improvement?

[talavis]

But the other ones lead to improvement?

Yes, but as the other_names table is not that large nor used very often (only for searches) the improvement is not as notable.