Ada Utility Library 1.8.0

• Added support for immediate flush and file appending to the file logger
• Added support for RFC7231/RFC2616 date conversion
• Improvement of configure and installation process with gprinstall (if available)
• Added file system stat/fstat support
• Use gcc intrinsics for atomic counters (Intel, Arm)

Ada Utility Library 1.7.2

Bug fix release.