Starting to add support for entry management.
Rethinking how entries' files are stored locally. Clarifying some stuff in the entry forms.
Shutting up a warning.
[Fixes #73677734] Improving the withdrawal warning message.
[Fixes #73682082] [Fixes #73682964] Opening links from the entry form in new tabs.
[Fixes #73683446]  Display a form error message on bogus withdrawal.
[Fixes #73682620] Disallowing bogus email.
Tiny tweak for [#73682082].
[Fixes #73683882]
[Fixes #73683576]
[Fixes #73683664]
Starting to add some tests for the entry forms.
A how-to-enter page, and a working link to it.
[Refs #73682734] Simplifying entry management by tearing out separate feelie & data-file management stuff.
Correcting the header link to prize info; adding prize-info pages.
Tweak
Tweaks and corrections.
Merge branch 'plate-yo-self' into filesystem-update
[Fixes #73683882] Typo.
[Fixes #74012462]