More linear codes

Codes:
new class for BinaryCodes and some new codes
LA:
new class BinaryMatrix for faster row operations
Poly:
new basic class for binary multivariate polynomials

BCH codes

BCH codes
Some speed improvements

Small fixes

Smal fixes. Plus Poly has a now method to compute the weight of a polynomial.

Some small style changes

According to pylint

Small fixes

Small bug fixes in Poly and GF2

Factoring of polynomials

The Poly class now supports factoring.

More coding theory

Support for cyclic and Reed-Solomon codes.

square roots in Z_n

Support for computing square roots in Z_n

Faster iroot

v1.3.4

Update kryptools.ipynb

Bug fix

GF2: GF(2^1) now yields correct generators
Zmod: Zmod(1) now computes the order of the element correctly