Add SuffixedMultiWidget

[rpkilby]

Resolves #425. Not sure if this would be considered for a major/minor release given the API changes.

Changes:

• Add SuffixedMultiWidget
• Change RangeWidget to use min/max suffixes
• Add DateRangeWidget that uses after/before suffixes (could remove and just use RangeWidget`)
• Change LookupTypeWidget to just the field name and a lookup suffix. So, ?price=15&price_lookup=lt

TODO:

• docs.
• tests?

[codecov-io]

Codecov Report

Merging #681 into develop will decrease coverage by 0.12%.
The diff coverage is 93.54%.

@@             Coverage Diff             @@
##           develop     #681      +/-   ##
===========================================
- Coverage    98.11%   97.99%   -0.13%     
===========================================
  Files           15       15              
  Lines         1117     1148      +31     
===========================================
+ Hits          1096     1125      +29     
- Misses          21       23       +2

Impacted Files	Coverage Δ
django_filters/widgets.py	98.7% <93.54%> (-1.3%)	⬇️

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[carltongibson]

Looks good. I had thought that the new widget probably could not be the default, simply because it's contrary to the standard API...

[rpkilby]

I had thought that the new widget probably could not be the default, simply because it's contrary to the standard API...

Makes sense.

Eventually (next major version?) should the default change to using SuffixedMultiWidget?

[carltongibson]

Eventually (next major version?) should the default change to using SuffixedMultiWidget?

Not sure at this point. 🙂

[rpkilby]

Okay - the breaking changes have been split off into a separate commit, and I'll submit a new PR for consideration once this has been reviewed/accepted.

[carltongibson]

Eventually (next major version?) ...

I'm coming round to a 2.0, dropping Python 2 support.

[rpkilby]

Pushed the breaking commit to suffixed-multiwidget-default so I don't lose track of it.

[rpkilby]

rebased

[carltongibson]

👍