Consistently handle "default values" for dataset pages

[pbeshai]

Not clear currently if we want to have defaults or not. I think the result of our conversation with HMS was that we didn't want default values if they are coming straight from the dataset page, but to still support contextualized entry via entityId

[vlandham]

that is what i would like to propose as well.

if we have an :entityId / :entityType we show the best display we can on
initial page load.

If this is not present, we show no defaults - but ensure we have
explanatory text to encourage user interaction.

On leaving dataset page, we clear filters and reset to initial state.

On toggling of viewBy, we do not reset filters - but maintain both during
the duration of time on the page.

Another optional level of refinement:

On toggling of viewBy - if we have not been to that viewBy before and we
have selected an entity (i.e. cell type / receptor) on the previous viewBy,
then we use this selected entity to inform the presentation of data.

On Thu, Jun 9, 2016 at 7:08 AM, Peter Beshai notifications@github.com
wrote:

Not clear currently if we want to have defaults or not. I think the result
of our conversation with HMS was that we didn't want default values if they
are coming straight from the dataset page, but to still support
contextualized entry via entityId

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[vlandham]

done in #211