Done using isort[1], with the following command:
```
isort -rc ./app ./tests
```
Adds linting to the `run_tests.sh` script to stop badly-sorted imports
getting re-introduced.
Chosen style is ‘Vertical Hanging Indent’ with trailing commas, because
I think it gives the cleanest diffs, eg:
```
from third_party import (
lib1,
lib2,
lib3,
lib4,
)
```
1. https://pypi.python.org/pypi/isort
This commit rearranges the CSV errors (again) to make them geared towards
teaching you how to match placeholders to the column headers.
So the order of errors now is:
1. No phone number/email column
2. Column headers don’t match placeholders
3. Missing or bad data
4. Trial mode
5. Daily limit reached
This depends on:
- [x] https://github.com/alphagov/notifications-utils/pull/39 for 1.
Makes uses of the additions to utils in https://github.com/alphagov/notifications-utils/pull/9
This commit strips out a lot of the complex stuff that the views and templates
in this app were doing. There is now a cleaner separation of concerns:
- utils returns the number and type of errors in the csv
- `get_errors_for_csv` helper in this app maps the number and type of errors
onto human-friendly error messages
- the view and template just doing the glueing-together of all the pieces
This is (hopefully) easier to understand, definitely makes the component
parts easier to test in isolation, and makes it easier to give more specific
error messages.
