auto_increment fields BIGINT UNSIGNED (#10548)
* Change Latitude and Longitude data types to DECIMAL instead of FLOAT
* Add system test that forces an integer overflow, currently failing as expected
* Make all overflow-able fields BIGINT UNSIGNED
* Make overflow-able fields BIGINT UNSIGNED
* These fields were not covered by the new SimulateAutoIncrementIntegerOverflow test
* fix comment
* Make it clear that id* fields are UNSIGNED when installing Piwik
* BIGINT(10) for consistency
* Update core fields to BIGINT
* UI tests: New fields to be updated to bigint
