Fixed bug in set_gene_descriptions where filtered descriptions were b…

Enscoresw 1844 - allow SliceAdaptor to consider negative coordinates, as well as open-ended ranges

Updated documentation in POD for the routine parse_location_to_values - Further updates to ENSCORESW-1844

Feature/searchbyontologylinkage

Enscoresw 1481 - allow mapper to return original coordinates as well as mapped coordinates in the result

New schema patches to allow the ensembl_ontology schema to work on ne…

[ENSCORESW-1997]. Enable local load data feature at the specific driv…

Replace deprecated Variation method

Unfortunately, creating an appropriate test turns out to be extremely incovenient
as one must make sure the underlying DBD::mysql has been compiled against a C library
where this feature is turned off.

This approach has been tested at the base class level and it seems to be working, so this
is more for:
- the team to quickly have a look and make appropriate suggestions;
- Andy Y to set up a proper test environment, run a test and confirm, as we've discussed.

Fixed bug in set_gene_descriptions where filtered descriptions were being ignored in favour of the original description

Release 87 patches

Remove setting of extra_data column in DNAAlignFeature table, so that new attrib adaptor is used exclusively. Port retiring extra_data eval code into AnalysisAdaptor, so that web_data can still be accessed, but eval is localised to a single class and not the entire set of adaptors.