Refs #1455: on Linux, at least, qtiplot build raises many many warnings when a function returns a const int; changed Algorithm's version() function to return just an int. These raise 'type qualifiers ignored on function return type' because the const on the return value is superfluous, according to: http://stackoverflow.com/questions/1134237/pedantic-gcc-warning-type-qualifiers-on-function-return-type