Fix to package documentation.
Non-working randDir implementation
Now hypersphere.sample should work.
Hypersphere sampling documentation.
Change hypersphere.sample to generate multiple samples.
Revert "Fix to package documentation."

 - Original statement about complexity holds. The O*((n-1)^3) complexity
   is when n is the dimension of a normalized weight vector, in which
   case the *sampling* space is of dimension n-1.

This reverts commit a874c4fc5b5447cb92fb930295a77b1be3227337.
gitignore
Use all.equal in example
Minor code style / consistency fixes
Prefix all C symbols with hitandrun_

To prevent name clashes with other packages