New Skel algorithm

Redesigned skeleton for Skel based algorithm to improve performance.

Asynchronous communication in the concurrent model

Agents use casts instead of calls to communicate with arenas reducing the number of lock collisions on the VM.

Exometer cleanup

Merge pull request #8 from ParaPhraseAGH/closing_exometer

exometer cleanup after the end of calculation

Exometer with VM stats

Introduced scheduler wall time monitoring

Introduced exometer for logging

Merge pull request #6 from ParaPhraseAGH/exometer

Introducing Exometer