* commit '8b4c9f848d63351c85cab3a5b2034f8e7e1a29db':
h5format_convert was not built (missing from subdirs in tools/src and tools/test Makefile.ams) but created dependencies that were not cleaned up by make clean and make distclean.
Create h5repack convenience library for common code used by h5repack tool and h5repacktst. Fixes broken distclean.
Added an --enable-developer-warnings option to configure so users can ignore -Wsuggest-attribute warnings and other noise that doesn't indicate poor code quality.
