v 1.5.2 some minor changes to documentation

v 1.5.1 Documentation and code cleaned up to pass CRAN requirements. 

v 1.4.9 
pava.fdr changed to output results in the same order as input p-values.

v 1.4.6 
pava.fdr changed to make use of faster isotonic regression in isoreg

v 1.4.5 

Fstat. Changed to take advantage of vectorised calculations. Permutation of residuals corrected.
