Integrate new parser

This PR will integrate the new parser in opm-core. The consequences of the PR are:

1. Opm-parser will be become a hard build dependency on opm-core.
2. The boost version requirement will be raised to 1.44

The methods using the old Parser are still there, and what will eventually be used depends on the calling scope; i.e. sim_fibo_ad from opm-autodiff.