When calling yearly_scalars_to_periodic_values it will rewrite values in elements.
It will group for "name" column and then process to aggregate.
Aggregation is happening as follows:
1: If the Entries are dicts (like input_parameter) it will take the first entry and leave it unchanged
2: Elif the Entries are lists or sequences it will check wheter they are sequences for the full period and write them to sequences, update foreign keys and write the foreign key.
3: Elif the entries are all equal the first entry will be written
4: Elif the entries are not equal they are written as a list

Also catching multiindex columns and Changing Typemapping to better type for Gas

Aggregation leads to empty fields that can be sequences. Fields that may be sequences are plumbed as `_Sequence` and afterwards saved in a wrong manner. When parametrizing the decorator should be updated to not plug values into plumbing and save them as they are.

Fix naming bug adding comment