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arpack tp build

Michael Turner requested to merge feature/arpack-tp-build into master

arpack is one of the last external libraries that nektar cant build for itself. With fortran being added to nektar cmake a while we added blas/lapack compilation but arpack was a bit trickier because the build system was basically a bash script.

The arpack project has been dead for a number of years but there is arpack-ng which is an effort by sandia to collect all the various patches people have made over the years since arpack died and put them in one place. Its still active having been updated a few weeks and most importantly it has a cmake interface.

This MR adds thirdparty build for arpack. I think it works, it compiles, but I dont think there are any tests for this.

This will close issue #41 (closed)

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