Copy frame files to run directory before starting PE
Since low-latency frame files are temporary, it is better to copy them to the run directory and make sure that those files are not removed between the time when GWCelery queries data files and the time when it starts PE. However, current
lalinference_pipe does not take path to frame files as inputs. For example, when it reads the state vector, it searches for data with
gwdatafind from input frame types instead of using input paths to frame types.