Re-implement -ks_hostURL atop -ks_URLByReplacingComponent:withString: to work around file URL bug on 10.6. Should also perform a little better.
Re-implement -ks_hostURL atop -ks_URLByReplacingComponent:withString: to work around file URL bug on 10.6.
Should also perform a little better.

mz2/KSFileUtilities,karelia/KSFileUtilities,paulkite/KSFileUtilities