Added table structure methods.

- TableSetUp() to set up the table structure.
- TableTearDown() to remove the table structure.
:information_source: Uses the configuration file settings.
Changed accuracy to int

Accuracy will be rounded up in order to save space in the database. Only
one entry per long/lat/accuracy. Perhaps the coordinates also have to be
limited later.
Added Location to Offer Constructors

Also: fixed ToString() method.