move to IndEcol and LGPL

Development

• Move the repository to the public IndEcol organization on GitHub: https://github.com/IndEcol/pymrio

Breaking changes

• dropped support for Python 3.7 and added 3.10 and 3.11
• License changed to LESSER GNU GENERAL PUBLIC LICENSE v3 (LGPLv3)
• added pyarrow as requirment

New features

• Autodownloader for GLORIA MRIO (by @hazimhussein)
• Support of parquet format for load and save function

Bugfixes

• Fix Eora downloader (by @hazimhussein)