Optimise sine and cosine for functions.

[michalkonecny]

Currently, the test

https://github.com/michalkonecny/aern/blob/master/aern-poly-plot-gtk/demos/testSineCosine.hs

is quite slow to produce not very accurate enclosures of sine and cosine.

In particular, sin(x+1) behaves much worse than sin(x), which should not happen.
Try fix small problems but postpone larger steps, such as trying new representations or a different series than the Taylor series.