Symbolica 0.18.0

Symbolica 0.18 has been released!

Notable changes

• CUDA evaluation exporter for fast GPU evaluations (thanks @APN-Pucky)
• New module system for community contributions in Python
• Add custom derivative for symbols
• External functions in expression evaluation
• Integer factorization, smooth prime iteration, primitive root iteration
• Discrete logarithm computation (Pohlig–Hellman for smooth primes) and linear recurrence relation solver (Berlekamp-Massey)
• Experimental GCD algorithm based on Hu-Monagan

Upgrade notice

• Builtin symbols are now members of Symbol instead of Atom, ie, Symbol::PI instead of Atom::PI
• symbol! now takes named settings,ie, symbol!("x", norm = |_,_,_| false)
• compile now takes a type to generate the appropriate code, ie compile::<f64> or compile::<Complex<f64>>