CUDA (NVDIA GPU) support

Update:
CUDA (NVDIA GPU) support for Evolver2D, 3x(double precision) - 10x (single precision) faster now.
Midpoint GLO4 GLO6 algorithm for 2D evolver

Supported problems:

• 1D evolution problem
• 2D evolution problem
• 1D initial value problem

Supported algorithm:

• Midpoint GLO4 GLO6 SPO2 SPO4 algorithm for 1D evolution problem
• Midpoint GLO4 GLO6 SPO2 SPO4 algorithm for 2D evolution problem
• RKO4 Midpoint GLO4 for the 1D initial value problem

Supported FFT libraries:

• kiss
• FFTW
• cuda