[Polyworld-develop] Polyworld now requires Qt 4.5

[Larry Y. <la...@in...>]

Polyworld now requires Qt 4.5 (or later).

Qt 4.5 greatly enhances Qt's compatibility with Mac OS X.  Frameworks 
and executables are placed in correct, default locations, eliminating 
the need for various environment variables and manually entered code 
paths in Xcode, substantially simplifying Polyworld's installation 
(and maintenance).  Qt 4.5 also can be installed from binary 
libraries rather than requiring a multi-hour build from source, 
further simplifying Polyworld's initial installation.  But in order 
to move to Qt 4.5, enough things had to change that Polyworld will 
now only build with Qt 4.5 (or later).

The build instructions at 
http://beanblossom.in.us/larryy/BuildingPolyworld.html have been 
updated.