MacOSX: Add a message to the first screen of the installer that tells

users how to avoid updates to their shell profile.

Mac/BuildScript/resources/Welcome.rtf

-{\rtf1\mac\ansicpg10000\cocoartf824\cocoasubrtf330
+{\rtf1\mac\ansicpg10000\cocoartf824\cocoasubrtf410
 {\fonttbl\f0\fswiss\fcharset77 Helvetica;\f1\fswiss\fcharset77 Helvetica-Bold;}
 {\colortbl;\red255\green255\blue255;}
 \paperw11900\paperh16840\margl1440\margr1440\vieww9920\viewh10660\viewkind0
@@ -12,4 +12,7 @@
 \
 MacPython consists of the Python programming language interpreter, plus a set of programs to allow easy access to it for Mac users (an integrated development environment, an applet builder), plus a set of pre-built extension modules that open up specific Macintosh technologies to Python programs (Carbon, AppleScript, Quicktime, more).\
 \
-See the ReadMe file for more information.}
+See the ReadMe file for more information.\
\ No newline at end of file
+\
+\
+This package will by default update your shell profile to ensure that this version of Python is on the search path of your shell. Please deselect the "Shell profile updater" package on the package customization screen  if you want to avoid this modification. }
\ No newline at end of file