Add rule to modify model file or insert/overwrite data in datapackage with Monte Carlo outputs

[willu47]

To perform the Monte Carlo run, we need to programmatically insert data into the OSeMOSYS model files before performing the run.

• [x] Investigate using OeMOSYS_PuLP to do the model runs #3
• [x] Investigate function in OSeMOSYS/PuLP which inserts data from MC template #4
• [x] Write script to perform the inserts #5
• [x] Add rules to the workflow #6
• [x] Add configuration file to define parameters, parameter ranges and distributions (could add this directly to snakemake config file) #7