Allow email alert radius to be specified.

[dracos]

Fixes #68 (!)

[codecov]

Codecov Report

Merging #3350 (415aa0d) into master (350efa4) will decrease coverage by 0.01%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #3350      +/-   ##
==========================================
- Coverage   82.37%   82.35%   -0.02%     
==========================================
  Files         324      324              
  Lines       21403    21418      +15     
  Branches     3222     3226       +4     
==========================================
+ Hits        17630    17639       +9     
- Misses       2732     2739       +7     
+ Partials     1041     1040       -1     

Impacted Files	Coverage Δ
perllib/FixMyStreet/DB/Result/Alert.pm	100.00% <ø> (ø)
web/cobrands/fixmystreet/fixmystreet.js	70.68% <0.00%> (-0.37%)	⬇️
perllib/FixMyStreet/App/Controller/Alert.pm	92.11% <92.30%> (-0.15%)	⬇️
perllib/FixMyStreet/Script/Alerts.pm	90.55% <100.00%> (+0.05%)	⬆️
web/cobrands/fixmystreet-uk-councils/alloy.js	87.12% <0.00%> (-2.98%)	⬇️
web/js/front.js	82.25% <0.00%> (-1.62%)	⬇️
perllib/FixMyStreet/App/Controller/Rss.pm	70.23% <0.00%> (+1.86%)	⬆️

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[davea]

As easy as that! Looks good 👍