fix the bug introduced by #147 in GatingSet constructor based on the existing GatingHierarchy
optimization for getData. #148
change getData to getSingleCellExpression #148
wrap most of logic within cpp API R_getSingleCellExpression. #148
1.support empty comp 2. support fasinh transformation #149
eliminate redundant [ operation on ncdfFlowSet in getData method. #122
move interpolation of EllipsoidGate (#142) to its transform function due to the changes made for #147
use getKeywords only when execute is FALSE since this R API has not been fully tested on different workspaces yet. #147
restore the logic of prefixColNames setting for the use case of cid = -1
update Rd file
merge from trunk