Rewrite start scripts for Sandtable and non-Sandtable version

[x0range]

Currently, many things are repeated in different places in the code such that the code works for both cases. The Sandtable version is not yet committed to the code base.

As much code as possible should be shared between Sandtable and non-Sandtable versions. The two startscripts (Sandtable and non-Sandtable) should only do what is actually different. They both should do the following:

1. read the event schedule from files,
2. setup the simulation schedule,
3. call start.py for each simulation,
4. collect the results, and save them the new save data object.

[jsabuco]

Can we close this issue?