Add primary key to temporary table after insertion

See merge request !14

Use pandas to read header

See merge request !12

Refactor definitions

See merge request !11

Fix insertion when two columns are based in the same header

See merge request !10

Create table with columns information present in table definitions

See merge request !9

Add year_column to settings

See merge request !8

Add denormalizations to run aggregations

See merge request !7

Add submodules

See merge request !6