repair / disable resume mechanisms

[behrisch]

currently tsc_main and t2s try to resume an aborted process but this may fail because they only check for the existence of files to determine whether a step was successful (and sometimes the files are empty or otherwise broken). Possible solutions

• explicit logging of success to determine where we can safely pick up the intermediate results
• enable overwrite at least for the daemon mode such that it will not pick up any intermediate results