[REFACTOR]
 - took the ore_algebra-specific code into a separate file called ore_algebra.c
 - took the the protocol is available in impl.c

[UPDATE]
 - Added isZero-functions for members of the Galois-field and for Ore polynomials
 - Added equality tests for members of Ore-Polynomials and members of the Galois-field.
 - added tests for the ore_algebra package under ore_algebra_tests.c