GridPath v2025.2.0

What's Changed

• Enhancement: Allow negative inflows by @anamileva in 731fc37
• Feature: Add 'constant' elevation type by @anamileva in #1204
• Bugfix: Tx availability fixes to work with iterations by @anamileva in #1206
• Bugfix: Iterations directory structure -- various fixes by @anamileva in #1207

Full Changelog: v2025.1.0...v2025.2.0