Merge pull request #248 from plomino/jean-flake8-make-pretty

Tidying, pass parameters readably.
Don't raise AttributeError if form mentions a nonexistent subform.
Merge branch 'github-main' of github.com:plomino/Plomino into github-main
Don't raise AttributeError if form mentions a nonexistent subform.
writeMessageOnPage in addition to logging.
new travis config
Merge branch 'github-main' of github.com:plomino/Plomino into github-main
tets coverage
Start to make potentially expensive operations POST-only.

This will help prevent triggering a refresh accidentally, such as
when restoring a browser session after a crash.
replace jq with $
rename jq in $: 25493 in tal string
Merge pull request #249 from plomino/jean-skip-missing-subforms

Don't raise AttributeError if form mentions a nonexistent subform.
Merge pull request #253 from plomino/jean-manage-postonly

Start to make potentially expensive operations POST-only.
fix date field
delete does not redirect to /None if no returnurl
merge