Improves visual identification for sensors
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* Fix Zynos temp warn limit
And others, but this seems to be the only one that uses
remove some odd limit restriction in the poller
* More consistent rounding for sensor limits
* round all numeric limits to 10 digits
* update test data
* Remove complex calculation as negative limit values are already swapped as needed.
* target db_schema
* Database schema cleanup
Remove several inconsistencies (mostly with data types and lengths)
Make things a bit nicer to implement with Laravel database migrations.
poller* tables had f'd up indexes
* Update tests, extra noise because db returns numeric types now.
* Update test data again.
* fix 253 migration for mysql 5.3
* Add contact,relay,outlet discovery; update yaml,snmprec,json
* Fix formatting
* Another attempt at fixing sensors
* Update state mappings and fix json sensor ordering
* Capture values numerically.
Remove extra if/else statement
Make test data more interesting.
* Fix whitespace.
* Update sensors test data for order_by
