0.6.1

Minor release. Largest change is bringing online Morello CHERI support.

• CHERI support (#537, #542, #532, #543)
• Improve error messages for checks (#526, #521)
• Increased checks on client (#520, #550)
• Portability fixes for Haiku and older versions of glibc (#545, #546, #533)
• Expose macOS malloc_good_size (#538)
• General code tidying (#527, #535, #547, #551, #536, #534, #529)
• Documentation (#551, #522)

Thanks to the external contributors @panekj, @devnexen and @mfelsche.