More flexibility when scheduling runs

[lang-m]

A separate _schedule_commands methods is now used to create all required calculator calls for a script. This is required to take calculator specific details into account, e.g. OOMMF requires calls to launchhost and kill in addition to the "actual" call.

With these changes the dry_run option is not any longer needed in the public interface and therefore I removed it.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (4d9428e) 99.82% compared to head (8d615b9) 99.82%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #72 +/- ## ======================================= Coverage 99.82% 99.82% ======================================= Files 30 30 Lines 559 559 ======================================= Hits 558 558 Misses 1 1 ``` | [Impacted Files](https://app.codecov.io/gh/ubermag/micromagneticmodel/pull/72?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ubermag) | Coverage Δ | | |---|---|---| | [micromagneticmodel/runner.py](https://app.codecov.io/gh/ubermag/micromagneticmodel/pull/72?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ubermag#diff-bWljcm9tYWduZXRpY21vZGVsL3J1bm5lci5weQ==) | `96.00% <ø> (-0.30%)` | :arrow_down: | | [micromagneticmodel/driver.py](https://app.codecov.io/gh/ubermag/micromagneticmodel/pull/72?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ubermag#diff-bWljcm9tYWduZXRpY21vZGVsL2RyaXZlci5weQ==) | `100.00% <100.00%> (ø)` | |

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[fangohr]

Content approved.