Add Links to Dbxref and Ontology_term associated with gene models

[nathanhaigh]

Functional annotation was added to the gene models. These include PFAM, InterPro and GO.

It would be good to provide users with a link out to databases with information about these DB references.

[nathanhaigh]

This can be achieved through callbacks defining functions of the form fmtDetailValue_* (where * is the GFF3 attribute tag: http://gmod.org/wiki/JBrowse_Configuration_Guide#Customizing_CanvasFeatures_tracks_with_callbacks

The following gist will help: https://gist.github.com/sestaton/ff9424f28b165e761e934f078f07249f

[nathanhaigh]

Fix up the code by:

• [x] making it case insensitive for attribute tag matching
• [x] update the PFAM link to a working resource

See: https://gist.github.com/nathanhaigh/e7a6cca1bb38704059493359e055c91b

[nathanhaigh]

I implemented both Dbxref and Ontology_term code for HC and LC genes tracks:

I also added Ontology_term linking for SO in Transposable Elements tracks: