Co_broadcast derived types; installation enhancements & bug fixes

New functionality

• When using GCC versions >= 10.0.0, co_broadcast now supports derived-type arguments with allocatable components. 🎺
• When building GCC on macOS versions 18.7.0 (Mojave) or greater, install.sh now provides directions on how to install header-file prerequisites if missing. 🚧 🏗 👷

Expanded test coverage

• Revised an existing test of co_broadcast with derived type arguments so the test passes with GCC 7.
• Added a comprehensive test of co_broadcast with 15-dimensional allocatable and pointer components.

Bug fixes, installation enhancements, & documentation updates

• install.sh installer now passes newly required flags for building MPICH with GCC versions >= 10.0.0. 🇺🇸 🇩🇪 🏴 🇬🇧 🎏
• caf compiler wrapper now correctly falls back to dynamic linking. ☕️
• INSTALL.md and README.md now reference a comprehensive listing of package managers along with each one's status. 🚦

Installation

Please see the installation instructions for more details on how to build and install this version of OpenCoarrays.

---