Fix regenerating the dotplot when requested

The dotplot is regenerated when the option is set. Removes the
regenerate option from the link; otherwise, the analysis will be
generated if the analysis is missing.

	modified:   web/SynMap_new.pl
	modified:   web/js/synmap.js
	modified:   web/tmpl/SynMap.tmpl
Reset the dialog before each run

Fixes issue where the dialog is not properly reset on a failure and
then displays the success state.

	modified:   web/js/synmap.js
	modified:   web/tmpl/SynMap.tmpl
Enable histogram support

The histogram data will attempt to be download the histogram or fail
and not display the histogram. A list of available files needs to be
returned back from SynMap so that the dotplot can gracefully degrade
functionality.

	modified:   web/tmpl/partials/synmap_results.tmpl