[dune-pdelab] Typetree cleanups

[Christoph Grüninger]

Dear PDELab developers,
please find attached four Typetree patches.

1) Replace some left-over "pdelab" by "typetree"
2) Cleanup the CMakeLists.txt
3) Add file extensions to Doxygen pages
4) Fix version number to not be 3.0 but 2.4 instead.

Please apply by using "git am -k <patch>"

Bye
Christoph

-- 
Je n'ai rien contre les étrangers, quelques uns de mes 
meilleurs amis
sont des étrangers. Mais ces étrangers là ne sont pas de chez 
nous!
[Agecanonix, Astérix - Le cadeau de César]
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