Write initial values to eclipse format output.

This yields output files that have the same behaviour as
eclipse in terms of number of steps, and what the steps mean.
Removed dead code.

The code was partially kept as a reminder to implement
proper well reporting and mass balance reporting. Now
well reporting has been taken care of, so we remove
the code.
Remove more unused code.
Merge pull request #79 from atgeirr/initial-summary-output

Initial summary output, remove dead code.