Better handling for duplicate citations

[strum3nt]

Currently if the pipeline finds a case with a citation that is a duplicate to one in the database (eg jdo_1368576000000_d586396a-9c35-49a7-8e2b-808f6e2dfb19.pdf and jdo_1367928001000_634b6b96-c11b-4df1-acee-3e9a3a13d66b.pdf) the case is inserted into the database but one case will have no citation record (due to ON CONFLICT DO NOTHING).

This requires a workaround in the front end to hide any case that does not have a citation record (but that is not ideal because someone may want either or both cases eg in the above the reissued judgment is important).

Therefore the database insert may need to be modified so that if there is a conflict, it handles that by generating a new citation record eg [2013] NZHC 988 could be edited to [2013] NZHC 988-a