Further evolution of "Magic formula" backtest, short only, added 3rd factor, added sector constraints, parametrized factor weights
Assess potential on the short side and add several enhancements.
- short-only
- added third factor
- added user's ability to allocate factor weights
- added user's ability to allocate portfolio weights between industry sectors.
- more work and discoveries on best ways to preprocess and store input data at higher frequencies
- switch from CLI inputs to YAML files for parameter specification.