Quote unset array element to avoid globbing interference (Alioth: #314708)
Various mostly array element unsetting fixes under failglob
ssh-add, ssh-keygen: -? needs to be quoted under failglob (Alioth: #314709)
Quote _filedir arguments when appropriate to prevent failglob failures
slapt-src: split options from their arguments
slapt-{get,src}: Fix issue with sed not being able to handle some characters

 # LC_ALL=C slapt-get --search "^moo" | sed -ne "/^moo/{s/ .*$//;p}"
 moos-project-viewer-2.8.1-x86_64-1sl [inst=no]: moos-project-viewer - Free Viewer for Microsoft®

 # LC_ALL=C slapt-get --search "^moo" | LC_ALL=C sed -ne "/^moo/{s/ .*$//;p}"
 moos-project-viewer-2.8.1-x86_64-1sl