Prevent Armadillo from finding HDF5

Adds CMAKE_DISABLE_FIND_PACKAGE_HDF5 to ArmadilloVariables.cmake. The latter is
read prior to configuring Armadillo.
Closes #107.
Revert "Deleted bempp_setup.cfg.template"

This reverts commit 3359304bf4d2a402471bdd12ce5b524d1897aa8f.
Merge branch 'master' into rsdt/new_build
Deleted old meshes directory