Use the -1s method to set end of disk during windows partition generation.  Clean up the rest of the parted commands so they use the -a opt methods vs the u kB or combined u kB and -a opt.

git-svn-id: https://svn.code.sf.net/p/freeghost/code/trunk@2088 71f96598-fa45-0410-b640-bcd6f8691b32