Fix some comments:  Remove button description from GPIO interrupt handlers that derive from the button interrupt handler

More vfork():  If we get to vfork() via system call, then we need to clone some system call information so that the return form the cloned system call works correctly

Fix vfork().  Now that arguments are kept on the stack, the way that arguments are passed from parent to child in vfork() must change.  This bug has always been present, but was not visible with the old strdup() way of passing arguments

Add basic data structures that will allow us to move named semaphore support out of the OS and into the VFS (not complete).

Add basic data structures that will allow us to move named semaphore support out of the OS and into the VFS (not complete).