Bugfix thanks to #32

some cleaning.

v0.4.2: Convert mimic and amsterdam data to parquet before 1_extract

v0.4.1: eicu database converted to parquet before processing

v0.4.0: Use polars to speed this up

v0.3.2: accurate variables in omop tables and other minor changes

v0.3.1, see release notes

v0.3.0: Adapted pipeline to MIMIC-IV v2.2, improved speed by changing…

… storage of timeseries, fixing bug from Issue #21

removed filtering of low lengthsofstay + added missing columns in OMO…

…P tables, see Issue #17

quickfix Issue #15