Imported Upstream version 3.7.6
Merge tag 'development/3.7.6' into raring

Upstream version 3.7.6
Update und remove unneeded patches
Update copyright, libcruft was moved to liboctave/cruft
replace deprecated command
Update fltk dependency
Launchpad PPA release
import mercurial patch that fixes typo in plot functions
Launchpad PPA release