remove DMG creation from the Xcode build process
convert DMG script to UTF-8
use cp instead of CpMac

…to preserve code signing information
add a build script for public releases
build script improvements

* dump the verbose output to a log file
* get all environment variables in a consistent way (from Xcode)
* turn off the `debug` option when running buildDMG.pl
Merge pull request #1658 from quicksilver/dmg

Update build process
increase build number to 4008

It needs to stay higher than the v1.1.x branch