major/minor replaced with a single field (dev_t) in devfs_entry

	"fcb" killed; stuff that used to be handled by it (block/char/regular)
moved into the same union where the rest of cases are handled.

	* DEVFS_FL_AOPEN_NOTIFY removed (b0rken, used only by vt on the kernel
side, unus{ed,able} on the userland side
	* DEVFS_FL_HIDE removed (unused)
	* ->lock, ->open and ->aopen_notify removed (not used anymore)
	* code slightly cleaned up

	* devfs_get_handle() lost 3rd, 4th and 5th arguments (3rd and 4th are
always 0, 5th is ignored in that case)
	* _devfs_find_by_dev() removed
	* _devfs_find_entry() lost 3rd, 4th and 5th arguments
	* devfs_find_and_unregister() removed
	* devfs_get_maj_min() removed
	* IS_DEVFS_INODE() removed
	* DEVFS_MINOR() removed

	switched to devfs_remove(), killed gratitious devfs_handle_t variable.

	switched to devfs_remove(), killed gratitious devfs_handle_t variable.

	switched to devfs_remove(), killed gratitious devfs_handle_t variable.

	switched to devfs_remove(), killed gratitious devfs_handle_t variable.

	switched to devfs_remove(), killed gratitious devfs_handle_t variable.

	switched to devfs_remove(), killed gratitious devfs_handle_t variable.

	switched to devfs_remove(), killed gratitious devfs_handle_t variable.

	switched to devfs_remove(), killed gratitious devfs_handle_t variable.

	switched to devfs_remove(), killed gratitious devfs_handle_t variable.

	switched to devfs_remove(), killed gratitious devfs_handle_t variable.

	switched to devfs_remove(), killed gratitious devfs_handle_t field.

	switched to devfs_remove(), killed gratitious devfs_handle_t variable.

	switched to explicit devfs_register()/devfs_remove(), killed gratitious
devfs_handle_t variables.

	switched to devfs_remove(), killed gratitious devfs_handle_t variables.

	switched to explicit devfs_register()/devfs_remove(), killed gratitious
devfs_handle_t variables.

	switched to explicit devfs_register()/devfs_remove(), killed gratitious
devfs_handle_t variables.

	switched to explicit devfs_register()/devfs_remove(), killed gratitious
devfs_handle_t variable.

	switched to devfs_remove(), killed gratitious devfs_handle_t variable.

	switched to explicit devfs_register()/devfs_remove(), killed gratitious
devfs_handle_t variable.

	switched to explicit devfs_remove()

	switched to explicit devfs_register()/devfs_remove()

	switched to devfs_remove(), killed gratitious devfs_handle_t fields.

	switched to explicit devfs_register()

	switched to explicit devfs_register()/devfs_remove()

	switched to devfs_remove(), killed gratitious devfs_handle_t variable.

	switched to devfs_remove(), killed gratitious devfs_handle_t variable.

	switched to explicit devfs_register()/devfs_remove()

	switched to devfs_remove(), killed gratitious devfs_handle_t array,
	cleaned up the failure exit path in init().

	switched to devfs_remove(), killed gratitious devfs_handle_t field.

	switched to devfs_remove(), killed gratitious devfs_handle_t field.

	switched to explicit devfs_register()/devfs_remove()

	switched to devfs_remove(), killed gratitious devfs_handle_t fields
	(actually, one of them became gratitious and another was completely
	 unused to start with).

	switched to explicit devfs_register()/devfs_remove()

	switched to devfs_remove(), killed gratitious devfs_handle_t variable.

	switched to devfs_remove(), killed gratitious devfs_handle_t arrays.

	switched to explicit devfs_register()/devfs_remove()