Add functionality for Airflow DAGs

Add delete/modify capability for airflow dags

Aligned with openEO v0.4.x

Minor changes to align to openeo-pg-parser-python v1.0.0

Merge pull request #10 from eodcgmbh/pg_parser_0.4

Pg parser 0.4

Bindings to eoDataReaders v1.0.1

New version of the bindings, aligned to eoDataReaders v1.0.1 and to openEO v0.4.x

Minor updates

Fix tests

Bindings for openEO v0.4.x

Unified structure to write Airflow DAG files, or simple python scripts, with eoDataReaders syntax converted from the openEO syntax as of version 0.4.x.