Initialize the Simile interface
This tells the package where to find an installed copy of Simile. It then loads the Tcl command implementations in the Simile installation to enable R's tcltk package to communicate with Simile's saved executable models. It should be called only once in a session.
Absolute or realtive path to top directory of Simile installation, e.g., "c:/Program files/Simile5.97" or "/usr/lib64/Simile-6.3"