Ignore some error codes that can be given by modulecmd, these can happen withsymlinks with which point to a directory where we have no read persmissions

 This should be allowed, since this system of pointing to unreadable directories allows us to hide modules where a user has no acces to anyway
 but they will automatically show up for users who have the right permissions.
fixed ordering
Merge pull request #609 from JensTimmerman/ignore_module_warnings

Ignore some error codes that can be given by modulecmd, these can happen...