made some dependencies optional, install via `pip install wetb[prepost]` to install with dependencies needed by prepost or `pip install wetb[all]` to install with all dependencies
made some dependencies optional, install via `pip install wetb[prepost]` to install with dependencies needed by prepost or `pip install wetb[all]` to install with all dependencies
Updated the build process, versioning now complies with PEP440
prepost can now generate pbs files withouth using wine (Linux)