Initial attempt at implementing DCT and IDCT methods.
Finish of types 1-3 and inverses.
Merge remote-tracking branch 'chebfun/feature-ultra-methods' into feature-dct
Merge branch 'development' of github.com:chebfun/chebfun into feature-dct
Redoing DCT1-3, IDCT1-3. Also implementing DCT4 and IDCT4.
Adding test for DCT1-4 and IDCT1-4.
Adding code for dst and idst for kinds 1-4.
Improving help text for the DCT/DST commands
Relate chebfun.dct() to dct().
Relate CHEBFUN.DST() to MATLAB.DST() from PDE toolbox.
Merge branch 'feature-dct' into development