CHANGES IN sgr VERSION 1.3.1

CHANGES
  * Updated NAMESPACE and URL reference

  CHANGES IN sgr VERSION 1.3

CHANGES
  * Added controls and fixed bug in rdatagen function. 
  * Updated bibliography.

  CHANGES IN sgr VERSION 1.2

CHANGES
  * Changed amse and arb functions in case in which true parameter value is zero.
  * Updated bibliography.