3.6.0 Parallel callbacks

This release supports Julienne clients that use an SPMD parallel programming model other than Fortran's multi-image features. Such users may now direct Julienne to call client code for such things as process synchronization or identification.

What's Changed

• Chore: remove legacy test driver (issue #163
• Feature: support multi-image parallel callbacks (issue #57) by @bonachea in #157
• Documentation: add Caffeine and band_distribution to client software list by @rouson in #154
• Fix recent ifx regression by @bonachea in #156
• CI: Add coverage for flang-21 on macos-26 by @bonachea in #159
• Fix: convert reported test-suite run time to seconds with flang by @rouson in #158
• Improve intentional failure output by @rouson in #160

Full Changelog: 3.5.0...3.6.0