Fix various minor issues (#545)

* Add absolute URL to power tests

* Update to target Python 3.10

* Return user to current page when clicking 'mark reviewed'

* Add units to power test record detail and form

I'm a bad scientist (coz I'm an engineer)

* Allow a higher value in PSSC fields

* Default venue to event venue in EC/PT

* Fix population of initial venue values for EC/PT

* Add link to create power test from EC detail

* Do not set power plan field to required on RA

"This might be a problem if the risk assessment is being done by one person and the power plan by another."

* Default power MIC to MIC

* Implement some suggestions from the Doctor

* Prevent checking in to cancelled events and dry hires

Will close #539

* Exclude dry hires from H&S overview list

* Add "ex VAT" tooltips to asset purchase price and replacement cost

* Automagically clear and focus ID field when audit modal closes

Closes #533

* Delete unused things

* Allow two decimal places in cable length, show training item IDs in selectpicker

Will close #540

* Fix #524 500 Error when viewing qualification list for items nobody is qualified in

* Update README.md

* Add a guard against nulls in recent changes

Maybe fixes #537 I'm unable to replicate locally

* Turn down verbosity of CI tests, fix tests, potential speedup

* Squash migration

* Add encoding to open

* Update to v3 upload-artifact

Resolves a deprecation warning

RIGS/templates/event_form.html

@@ -209,7 +209,7 @@
                                     <div class="col-sm-9 col-md-7 col-lg-8">
                                         <select id="{{ form.venue.id_for_label }}" name="{{ form.venue.name }}" class="selectpicker" data-live-search="true" data-sourceurl="{% url 'api_secure' model='venue' %}">
                                         {% if venue %}
-                                            <option value="{{form.venue.value}}" selected="selected" data-update_url="{% url 'venue_update' form.venue.value %}">{{ venue }}</option>
+                                            <option value="{{venue.id}}" selected="selected" data-update_url="{% url 'venue_update' venue.id %}">{{ venue }}</option>
                                         {% endif %}
                                         </select>
                                     </div>