Added the specifications of data types in the insert functions

Merged Danijel Schorlemmer requested to merge feature/insert_functions into master

The database class provides functions to insert datasets into tables to avoid SQL statements in the data-processing code. The functions used initially tuples and are now switched to take each value of the dataset separately with proper type definition. I also changed the naming of some fields in the database to reflect the style we adopted in the loss calculator.

\approve @cnievas @tara @prehn \fyi @shinde

Merge request reports