Adds bidiagonal representations
Generates matrices of Haar measure for beta=1,2
Adds sphericity tests
Add kernels for stochastic processes
Adds piecewise Haar correction
Fixes Brownian process
Update README.md
Removes singularities
Prototype of symbolic Haar integrator.

Currently has a bug where the indices of the Haar matrices are assigned incorrectly.
Fixes up symbolic integration, leaves only coefficient calculation
Working (but untested) version of symbolic integrator over Haar measure
Fixes exports and abstracts Haar random matrix types
Fixes Haar symbolic integrator to work out of scope