Adding 'retriever download' alias to 'retriever install download' for simplicity.
Replace all non-downloading methods in download_only engine with a dummy method.
After running download_only script, copy all files into the home directory. Moving this step from bioclim script to the engine.
Overloading some more methods for download_only engine to correctly handle downloads.
Get rid of insert_data_from_file.
Refactoring try_install_all to take an optional list of engines to test.
This set reset isn't needed and might mess things up. Keep track of all found files until final_cleanup is called.
Removing print statement.
Adding path option to download engine.
Fail bioclim download on engines other than 'download only.'
Merge pull request #1 from bendmorris/download-engine

Download engine modifications