Added new 'copyfile' block to copy/move files and directories

[DavidJBianco]

This creates a new "copyfile" block under the "Other" category. It allows you to either copy or move files/directories around on the local filesystem. In general, this block exhibits the same behavior that Unix cp and mv commands do with respect to having directories in the source and/or destination fields (e.g., moving a file into a directory works as expected, as does copying a directory into a directory).

[DavidJBianco]

Reviewing this, I realize that I forgot to add that it also supplies a "editkernelcmdline" block that allows editing the the parameters the kernel boots with.