Simplified filtering of variances
Unified usage examples in one function. Simulated and real data.
Remove test_real
Rename test function
Change test function name in bekk __main__
Hide computation of unconditional variance
New function bekk_recursion to remove repeated operations
Recursion replaced everywhere
Expose only unconditional_var member to the public interface
Relative imports
Move functions and classes into separate files
Move functions to different files. Add optional arguments to simulate_bekk from different distributions
Simulate innovations according to chosen distribution
Rearrange files into folders