DiseaseExtentGenerator now uses the country GAUL codes in the admin_unit_global/tropical table, rather than needing to look them up in the country table and store them in location.country_gaul_code. Consequently location.country_gaul_code has been removed.
Add logging to disease extent generator.
Add tests for DiseaseExtentGeneratorHelper.
Rename the disease extent parameter "minimum years ago for higher score" to "maximum years ago for higher score".
Hide NOTICE messages when creating the database, especially when the database is not dropped because it does not exist.
Merge branch 'master' into 184-disease-extent-tidy-ups

Conflicts:
	src/DataAcquisition/test/uk/ac/ox/zoo/seeg/abraid/mp/dataacquisition/diseaseextent/DiseaseExtentGeneratorTest.java
Trivial fix
Fix checkstyle violations
Simplification following review
Trim dead line
Merge pull request #121 from SEEG-Oxford/184-disease-extent-tidy-ups

Disease extent generation tidy-ups