Improve performance of environmental suitability calculation, for a batch of disease occurrences that all belong to the same disease group. This is done by reading the latest mean prediction raster for the disease group into memory, then using GeoTools to find the environmental suitability. PostGIS is still used for non-batched disease occurrences (i.e. those coming from Data Acquisition) because of the overhead of reading the raster into memory.
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Following review, DiseaseOccurrenceValidationService.addValidationParameters now explicitly checks that all occurrences have the same disease group
Merge branch 'master' into 235-es-performance

Conflicts:
	src/Common/ivy.xml
Merge pull request #174 from SEEG-Oxford/235-es-performance

Improve performance of environmental suitability calculation