Should be able to specify precision of numbers in LINST format

[driusan]

trafficstars

The LINST format uses decimal(14, 4) (previously decimal(10,0)) for the data type. This is not necessarily the right type for all fields, depending on what type of question is being asked / data collected.

We should have a way to specify the precision of the field so that bigger/smaller numbers can be stored in the SQL tables.

[regisoc]

Ref: #9277