iv is an SDL-based image viewer.

Changes on and after 2025-181 are tracked in Git.
Older change history:
- 2021-248 and before: main development (up thru v1.2)
- 2022-233 -t TITLE option, getopts cleanup, smaller zoom steps (v1.3)
- 2022-294 output coordinates from middle-click (v1.4)
- 2022-324 better zooming (v1.5)
- 2022-361 handle multiple files (v1.6)
- 2023-227 accept SIGTERM to kill/quit (v1.7)