v0.29.7

What's Changed

• Add fields for input and output data/meta to processor by @danielhuppmann in #580
• Add NutsProcessor for NUTS region aggregation by @dc-almeida in #569
• Add utility methods to RegionProcessor to create mappings between regions and country names by @dc-almeida in #578
• Close backlog of issues by @dc-almeida in #583
• Fix failing external repo test by @phackstock in #585
• Update to pyam-iamc v3.4.0 by @phackstock in #588

Full Changelog: v0.29.6...v0.29.7