Make skin dose map calculation a background task

[David Platten]

Ensure skin dose maps are calculated as background tasks whenever they are calculated. Will need to check that a particular skin dose map is not already being worked on before starting a new background task.

[David Platten]

Started to implement background skin dose map calculation when triggered from the detail view. Needs further work. Refs issue #1007

→ <<cset aabce1e52186>>

[David Platten]

Added calculation progress to the task so a user can see how the task is doing in the task view. Refreshing the rf_detail view also shows current progress (although this is requires the user to refresh the page). Refs issue #1007

→ <<cset 5c1d008507b8>>

[David Platten]

Hopefully fixing the pipeline failure. Refs issue #1007

→ <<cset e243cb9df170>>

[David Platten]

Prefetching some things might speed things up a little. Refs issue #1007

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[David Platten]

Adding a hyperlink to the tasks page from the rf_detail skin dose map calculation progress message. Refs issue #1007

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[David Platten]

Updating background task attributes if skin maps disabled, or if calculation fails. Can use this to update the status on the rf_detail page (not yet coded). Refs issue #1007

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[David Platten]

Improving messaging when skin dose maps fail or are disabled. Need to add code that will enable the user to force a recalculation of a skin dose map. Tests will fail at the moment, so [skipci]. Refs issue #1007

→ <<cset 973e13dfd634>>

[David Platten]

Adding code to enable the user to force a recalculation of a skin dose map [skip ci]. Refs issue #1007

→ <<cset ebcbcddd39b9>>

[David Platten]

Adjusting skin map tests so they work with the re-worked skin dose map code. Refs issue #1007

→ <<cset d0924b43cfa7>>

[David Platten]

Updating changes file. Refs issue #1007

→ <<cset fd3aa5e053c4>>

[David Platten]

Addressing codacy issues and fixing bug where None in the error field of a task caused an error to be thrown. Refs issue #1007

→ <<cset 0b7ed09b0773>>

[David Platten]

Addressing codacy issues. Refs issue #1007

→ <<cset f1ef35c8de0d>>

[David Platten]

Fixing merge conflicts. Refs issue #1007

→ <<cset 0a37ad81a9c1>>

[David Platten]

Fixing conflict in changes file. Refs issue #1007

→ <<cset 7062a4cec3df>>

[David Platten]

Updating skin dose map javascript and some other code to make the forced recalculation of a skin dose map clearer for a user. Refs issue #1007

→ <<cset a06131ed5601>>

[David Platten]

Changing netcat package to netcat-traditional to try and fix the pipeline error, as suggested here: https://forums.docker.com/t/package-netcat-has-no-installation-candidate-how-to-fix-this/136541. Refs issue #1007

→ <<cset 83d12456fb96>>

[Ed McDonagh]

I had just decided to go with the openbsd version but I think it won’t make any difference to us - we're just checking the ports are listening.

[OpenREM]

Fixing merge conflict - changes.rst only so [skip ci]. Refs issue #1007

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