AST-1090 Remove get* functions from InputStep
After !820 (merged), we can remove the InputStep::get* functions as well.
Use get* without arguments in MultiMsReader, so they don't clash with the get* functions in the MSReader base class.
After !820 (merged), we can remove the InputStep::get* functions as well.
Use get* without arguments in MultiMsReader, so they don't clash with the get* functions in the MSReader base class.