Fix tests in CMake build system
Remove mpz_t* casts
Use const in osl_int* functions
Add overflow detection
Factorize -, ++ and -- operations in osl_int
Add osl_int_size_in_base_2 and osl_int_size_in_base_10 functions
Add div, mod and gcd functions for osl_int
Add osl_int test
Merge pull request #16 from Lnc/osl_int

Update osl_int