FEValues for General types.

[luca-heltai]

Luca + J-P #4704

[luca-heltai]

• Come up with a failing test
• Rework/Discuss VectorSlice
• FEValues::internal::do_function* should take an ArrayView instead of Vector
• FEValuesViews should have a NumberType

[luca-heltai]

For @jppelteret

cleanup = "!git branch --merged master | grep -v '\*\|master\|develop' | xargs -n 1 git branch -d"

[bangerth]

@luca-heltai -- is this done now? If so, can you close it? If not, can you elaborate what the first two bullet points above require doing?

[bangerth]

@luca-heltai @jppelteret -- ping?

[jppelteret]

Thanks, I think that we've moved sufficiently far from this point that this is no longer relevant.