Alternative map views

[nickdos]

Investigate alternative views for showing sequence data on a map.

Currently it is using a grid view based on SOLR heatmap API. Some alternatives are:

• draw heatmap data as different sized circles based on density
• draw all records as dots (may have performance issue) and may need to be processed as tiles?

[nickdos]

Option 1 - not sure it works, in particular:

• grid is rectangular and circles don't fill horizontal space
• small points are hard to click on
• overlapping circles result in confusing UX as to which area is intended to be activated

[nickdos]

Put changes on this branch https://github.com/ARGA-Genomes/arga-web/tree/issue-43
Commit: 2708dce

[nickdos]

Minor changes to start with:

[nickdos]

Moving to done but will leave open in case other suggestions are passed on.