[bugfix] Removed erroneous template disambiguator.

My compiler (Debian g++ 4.7.2-5) error out with
"error: ‘template’ (as a disambiguator) is only allowed within
templates"

Indeed, ThreadParadigm is not a template class. Therfore I removed the
disambiguators.
[whitespace] Removed introduced tabs that broke formatting.
[bugfix] Removed erroneous typenames outside of templates.

For g++-4.4 these produced the error:
"mpiparallelparadigm.hh:546: error: ISO C++ forbids declaration of
‘constexpr’ with no type"

Indeed ThreadParallelParadigm is not a template.