Fix for issue #2573: Can't change the framework name on OS X builds

This introduces a new configure option: --with-framework-name=NAME
(defaulting to 'Python'). This allows you to install several copies
of the Python framework with different names (such as a normal build
and a debug build).
diff --git a/Misc/NEWS b/Misc/NEWS
index 19b80e2..8515238 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -141,6 +141,9 @@
 - Issue #2544: On HP-UX systems, use 'gcc -shared' for linking when
   gcc is used as compiler.
 
+- Issue #2573: On MacOS X it is now possible to install the framework
+  with a different name using --with-framework-name=NAME. 
+
 C API
 -----