Fixes #3741.
* symbiosis-generate-stats updated to be more flexible with file locations.
* symbiosis-generate-stats updated to be more verbose, when required.
* symbiosis-generate-stats now will not create the stats directory unless the
parent directory is owned by the same user.
* Symbiosis::ConfigFiles::Apache now uses Symbiosis::Domain#public_dir.
* Symbiosis::ConfigFiles::Apache has a couple of new methods, htdocs_directory
and cgibin_directory for use in templates.
* The templates have been updated to use these methods.