fix up mkfiles to use $GOROOT instead of $PLAN9 mention in setup doc that binaries go into $HOME/bin
fix up mkfiles to use $GOROOT instead of $PLAN9
mention in setup doc that binaries go into $HOME/bin

SVN=122177
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go