Bug#840454: Lowering the severity to important

[Tobias Hansen]

Control: severity -1 important

I'm lowering the severity to important to allow testing migration.
fflas-ffpack 1.6.0 in testing is broken since it build-depends on givaro
3.7.2, which is not in testing anymore. For now it is best to have a
working package for the architectures that work (and no package for the
other architectures).