use existing expansion instead of loading it from a file, i.e. turn into a eConvertExpToPts module
This changes the modules behaviour: Instead of setting the values at not located points to zero, the point is discarded. See the bfs_probe test for an example, where only oneof the two queried points is inside the domain, so the resulting bfs_probe.dat contains only a single point instead of two with one haveing zero values.
in parallel, the module now uses the partitioning from the explist instead of partitioning the pts by itself.
Fixes #68 (closed)