List of primes, to 200K.

Saving into a txt file into the project root directory, just temporairly.
This thing can be probably improved with a BN_bn2bin conversion.
primes.c : an iterator abstraction over the prime database primes.txt.

Note: this is completely fucked up: the path for loading the database is not
absolute, assumes the file stands in the project root directory. Moreover, the
loading uses the shitty scanf() function with "%s" - buffer overflows on the
road.