Provide a simple form which links to user requested heatmaps

fix channel_full_detail exception
fix heatmap links forgetting query_string https://simpleisbetterthancomplex.com/snippet/2016/08/22/dealing-with-querystring-parameters.html
cleanup displaying of filters on channel detail views
be carefull with years available

Edited Feb 15, 2024 by Simon Panay

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