Starts taking data from the current event source.
The current event source is determined by the
last call to spectcl.attach(),
or the last Tcl attach command,
whichever was more recent.
To allow Tcl scripts to be aware of the change in state,
the Tcl global variable RunState is
set to 1 as it is for the Tcl start
command.
If analysis is active, this method does nothing.