Update to 1.15.99.8

• Update documentation about configuration options
• Fix variable expansion while parsing pkg.conf and repositories
• Fix scripts never ending on MacOS
• Do not execute post-install script if extraction fails
• Fix fetching of meta.conf if it is missing
• Update lua to lua 5.3.6
• Improve solver missing some reverse dependencies
• 'audit' now accept a -R/--raw option for parseable output
• 'audit' can now ignore packages based on use define globs or regexp
• 'set' now reports when a package provided in command line is not installed
• all commands are now consistently using --no-scritps instead of different flavor per commands
• when request to install many packages unavailable in the repo, print all the missing one instead of stop at the first one only
• 'info' now prints the timestamp and repository in the --raw output
• Improve error messaging when parsing the configuration file
• when upgrading in dry-run mode: stop first checking for pkg, but show all the packages to be upgraded, pkg included
• Fix crash when pkg is told to package a directory as a file
• 'create' now accept -e to create package with an expanded version of the manifest aka readable
• Relax keywords attributes syntax by allowing spaces