SHARK v2.0 with GASPI/GPI2 support

GPI2 for ::get, ::put and ::iupdate
Automatic MPI Progress calling MPI_Test
Multi-threaded packing

SHARK v1.2 with minor MPI updates

What's new?

• More solvers in solvers/
• Directory structure cleanup
• BPMF application with SHARK (look at github.com/ExaScience/bpmf)
• spatial cache blocking support
• support for inner() and outer() regions
• support for dumping GAs