werkzeug's internal workings keep files under 500kb in memory, and files
greater than 500kb as a TemporaryFile
(https://github.com/pallets/werkzeug/blob/0.11-maintenance/werkzeug/formparser.py#L38)
when we encounter a CSV or TSV, we call normalise_newlines, which invokes
`.read()`, however when we were passing straight into pyexcel, we called
`file.getvalue()` - this exists on BytesIO (small files) but not on
TemporaryFile objects (large files) - we were seeing 500 errors
The GOV.UK content style guide says:
> - 5:30pm (not 1730hrs)
> - midnight (not 00:00)
> - midday (not 12 noon, noon or 12pm)
This commit changes all times to be 12h not 24h, and adds a special case
for when a time is exactly 12:00am or 12:00pm.
This commit makes the CSV download use the same language for failure
reasons as the frontend.
It also adds a test around this stuff, which was patchily tested before.
of the name against a list of all service email_from fields.
Update find_all_service_names to find_all_service_email_from, which returns the email_from of all services.
