Adds "pkgExt=" variable to set if pkgs are .tbz or .txz or other.
Auto-detects if packages are PKGNG or old PKG format.
Auto-bootstrap of PKGNG for the new installed environment.
Fixes issues with installing packages from local media, such as DVD/USB.
Switch to using a space-delimiter for installPackages, since a number
of packages use a "," in their version string.
Fix pc-sysinstall to ignore install scripts, and not hang on
user interaction prompts when installing pkgs.
Add pkg2ng command as apart of pkgng bootstrap process.
Obtained from: PC-BSD
