added device implementation of CSR->ELL conversion based on Steven Dalton's code
added device implementation of CSR->ELL conversion based on Steven Dalton's code

sdalton1/cusplibrary,cusplibrary/cusplibrary,sdalton1/cusplibrary,sdalton1/cusplibrary,cusplibrary/cusplibrary,sdalton1/cusplibrary,cusplibrary/cusplibrary,cusplibrary/cusplibrary