Introduced environment instvar in Tools::NavigatorModel. All references to Smalltalk were rewritten to access `environment` instvar instead. The `environment` defaults to Smalltalk (set in #initialize).

@REM -------
@REM make using Borland bcc32
@REM type bmake, and wait...
@REM do not edit - automatically generated from ProjectDefinition
@REM -------
make.exe -N -f bc.mak %*