math: Added new math functions (#2) Basically most of the standard C functions that were not already present in sqlite3 and a few more: - acos(X) - asin(X) - atan(X) - atan2(Y,X) - ceil(X) - cos(X) - cosh(X) - e() - exp(X) - floor(X) - log(X) - log10(X) - pi() - pow(X,Y) - sin(X) - sinh(X) - sqrt(X) - tan(X) - tanh(X)