detectMplus: Detect the location/name of the Mplus command
Description
This is an utility function to help detect the correct name/path to Mplus.
It tries hard across operating systems to find Mplus and if it cannot find
the full version of Mplus to find a demo version of Mplus.
Usage
detectMplus()
Arguments
Value
A character string that is the Mplus command possibly the path to the mplus command or an error if it cannot be found.