Fix various bugs + some improvements

[ddabble]

New features:

• Added button for selecting all shown course users (99ca8d4f1fe3475bd4b0d09cb6344c42b30af569)

Fixes:

• Fixed AttributeError in quote views (ea808b1b40af069d6a2209a9ce0518e4431b4912)
• Fixed selection bug in end time calendars (80dfb592a287443800294ab67a72369ccda8a1be)
• Fixed unable to reopen Fomantic-UI calendar (39439a5807495e3fba8d809e436eb4b78c13edef)
• Fixed error when reducing TemporaryUploadedFile (8c7c6e5f535d914fc345d47d826515eb75cb567f)
• Fixed error when initial image had been deleted (c3dbc26ee99c98c1ca24b0686ba29d8eb564a9b5)

Improvements:

• Made stream sockets wait before retrying setup (50fb01f08c7f642c5cdd9b65325b740a3456a6b4)
• Added warning message for reservation rule gaps (44b47b5b7e1133cf3fb4ae135faa8b5908cf2c13)
• Reordered admin panel buttons (b239e0655e1289931282a48ba3fe2fe3e27dfd1e)
• Don't use reduced image if it's not smaller (49c99bf1f3c3a678d042e00163bd8b6578c66bb1)

[codecov[bot]]

Codecov Report

Merging #447 (8549c59) into dev (d496ed3) will decrease coverage by 0.29%. The diff coverage is 59.03%.

@@            Coverage Diff             @@
##              dev     #447      +/-   ##
==========================================
- Coverage   88.54%   88.24%   -0.30%     
==========================================
  Files         134      134              
  Lines        5271     5335      +64     
==========================================
+ Hits         4667     4708      +41     
- Misses        604      627      +23     

Impacted Files	Coverage Δ
internal/views.py	89.50% <ø> (ø)
web/widgets.py	94.16% <ø> (ø)
util/formfields.py	33.33% <17.85%> (-7.41%)	:arrow_down:
util/file_utils.py	41.17% <33.33%> (ø)
util/model_utils.py	87.50% <75.00%> (-12.50%)	:arrow_down:
make_queue/models/reservation.py	94.61% <78.78%> (-2.32%)	:arrow_down:
faq/views.py	100.00% <100.00%> (ø)
make_queue/views/reservation/rules.py	98.88% <100.00%> (+0.05%)	:arrow_up:
news/views.py	96.57% <100.00%> (+<0.01%)	:arrow_up:
users/models.py	94.28% <100.00%> (ø)

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[ddabble]

Merging without approval, as the fixes and improvements would be useful to have live as soon as possible, and because the Dev committee has a shortage on members available to review.