Refactor series_by_lead wrapper

[bikegeek]

Refactor the series by lead wrapper to stop depending on a process id to identify a particular series by lead run. It was originally assumed that the tc-pairs wrapper, extract tiles wrapper and series by init wrappers would be run in succession to satisfy the origin use case/funding institution, as such, it was necessary to identify which groups of wrappers were associated. This dependence on identifying which output/input combinations via a process id makes it impossible to create a unit test for the series by lead wrapper. Currently, only a system test (where the series by lead wrapper is run after the tc pairs and extract tiles wrappers have been run) can be created, which checks the final output.

[bikegeek]

Merged updates to 'develop' branch. No longer create a subdir in the tmp directory based on the process id and after removing tmp dir, create a new, empty tmp dir so it is available if series by lead wrapper or another wrapper is to be run again.