fossil_delta a Python extension

This crate exports functions fossil_delta::delta and fossil_delta::deltainv to Python interepreter. The resulting library built with:

cargo build --release on Linux is named libfossil_delta.so. Before using in Python it has to be renamed to fossil_delta.so. On Windows it should be probably renamed to fossil_delta.pyd or fossil_delta.dll.

Usage:

```

import fossildelta a = """line 1 ... yet another (a bit longer) line 2 ... yet another (a bit longer) line 3 ... yet another (a bit longer) line 4 ... yet another (a bit longer) line 5 ... yet another (a bit longer) line 6 ... yet another (a bit longer) line 7 ... yet another (a bit longer) line 8 ... yet another (a bit longer) line 9 ... yet another (a bit longer) line 10""" ... b = """line 1 ... yet another (a bit longer) line 2 ... yet another (a bit longer) line 3 ... yet another (a bit longer) line 4 ... yet another (a bit longer) line 5 ... yet another (a bit longer) line 6 ... yet another (a bit longer) line 7 ... yet another (a bit longer) line 8 ... and finally last line 10 ... yet another (a bit longer) line 9 ... yet another (a bit longer) line 10""" ... d = fossildelta.delta(a, b) s = fossil_delta.deltainv(b, d) s == a True

```