Removes non-POSIX "ln -snf"; more error checking, comments, cosmetic changes; support for debugging. spkg-install (generated in/by spkg-dist): * The "-n" option to "ln" is non-portable, so we avoid it now. * Some more checks of command exit codes added. * Clarifying commments added, also to prevent later changes breaking things. * Messages "normalized". setup.py: * If SAGE_SETUPTOOLS_DEBUG="yes", we now enable output of distutils.log.debug() messages. Setuptools seem to ignore the DISTUTILS_DEBUG environment variable, though distutils' logging is used. Perhaps I'm missing something here, but this way it works.
…g packages to /devel
…of the interact
…ge the email part of registration form to actually use something from html5
… sets MIME types by extension.