Add confidence intervals for binomial distribution.

It doesn't work in cases p=0 or 1
Add special cases to handle p=0 and p=1
Remove deprecated modules

It's going to be massive API breakage. No point in keepeing old
mudoles around
Convert K-S test to new API
Improve documentation of rank function
Remove reexports

Now reexport doesn't do right thing so they should be removed
We will need to restore them at some point in the future though
Add function to interpret CL as p-value
Fix export list & warning
Fix test suite
Port Wilcoxon test to new API
Port Mann Whitney test to new API (partially)