Added improved _collect_op_deep which detects intersecting Adds and Muls expressions.
Big modifications on optimizations module. WIP.
Added new cse function.
Added new cse module which merges features both from subexprs and optimization; WIP.
Trying to improve sympy.cse(); WIP!
Implemented CSE algorithm based on SymPy CSE but faster (and with less features).
Improved Subexprs class: now it is based on my fast_cse.
Bugfix in in postprocess optimizations application in CSE.
Bugfix: reimplemented adds and muls CSE.
Merge Subexpr Add and Mul exprs treatment into a single handler function.
Update README.md