Merged 2.3b1 welcome message to the trunk.

Mac/OSX/Dist/resources/Welcome.txt

-Welcome!
+This program will install MacPython 2.3b1 for Mac OS X.
 
-This program will install Python 2.3a2 for Mac OS X as a Framework.
+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, a Python extension package manager),
+plus a set of pre-built extension modules that open up specific
+Macintosh technologies to Python programs (Carbon, AppleScript,
+Quicktime, more).
 
-Build number: 3
-Build date:   Thu Mar 20 18:54:52 PST 2003
+The installer puts the applications in MacPython-2.3 in your
+Applications folder, command-line tools in /usr/local/bin and the
+underlying machinery in /Library/Frameworks/Python.framework.
+
+The PythonIDE application has a Help command that gets you started
+quickly with MacPython and contains references to other documentation.
+
+More information on MacPython can be found at
+http://www.cwi.nl/~jack/macpython.html, more information on Python in
+general at http://www.python.org.