[UK] Add script to fix 2019-05 Boundary-Line.

[dracos]

Fixes https://github.com/mysociety/mapit/issues/341

The output when run without commit is:

(.venv) $ python manage.py mapit_UK_fix_2019-05 ~matthew/bl-2018-10/Data/GB/district_borough_unitary_ward_region.shp
Updating area E0501239 to E05012396
Updating area E05012199 to E05012208
Updating area E05006336 to E05012387
Updating area E05010394 to E05012991
Updating area E05009767 to E05012992
Updating area E05002732 to E05011571
Updating area E05010391 to E05012990
Updating area E05005857 to E05011847
Updating area E05005276 to E05012199
Updating area E05009795 to E05012630
Updating area E05005863 to E05011853
Updating area E05005865 to E05011854
Creating new E05002732 (DIW), Stretham Ward
Creating new E05005276 (DIW), Garrison Ward
Creating new E05010394 (DIW), Chartham & Stone Street Ward
Creating new E05010391 (DIW), Barton Ward
Creating new E05005863 (DIW), Roughton Ward
Creating new E05005865 (DIW), St. Benet Ward        
Creating new E05005857 (DIW), Mundesley Ward        
Creating new E05006336 (DIW), Seamer Ward
Creating new E05009767 (DIW), Kingston Bagpuize Ward
Creating new E05009795 (DIW), Saltisford Ward

[codecov[bot]]

Codecov Report

Merging #346 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #346   +/-   ##
=======================================
  Coverage   65.46%   65.46%           
=======================================
  Files          39       39           
  Lines        2189     2189           
=======================================
  Hits         1433     1433           
  Misses        756      756

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