[dune-functions] inconsistent class names in pqknodalbasis.hh

[Felix Gruber]

Hi all,

currently the classes in 
dune/functions/functionspacebases/pqknodalbasis.hh are all named with 
the prefix PQK (capital K), while dune-localfunctions uses the prefix 
PQk (with lowercase k) in the class names in 
dune/localfunctions/lagrange/pqkfactory.hh. Also all the Pk and Qk 
finite element classes are named with a lowercase k.

I propose to change the class names in pqknodalbasis.hh to make them 
more consistent with the naming scheme from dune-localfunctions.
This renaming of classes will definitely be an inconvenience for users 
of dune-functions, but in my opinion this inconvenience will be 
outweighted by the reduction of inconsistencies to dune-localfunctions 
which is used by many more people at the moment who might be annoyed at 
this inconsistency when starting to use dune-functions.

I attached a patch to dune-functions for my proposed change to the class 
names.

Cheers,
Felix
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