Two type of event local and remote

1) locals are used by the periphs to postopone their work

2) remote are used to ask a work to done by another cluster. The users are:
	- sys_fork.c
	- kern/sys_thread_create.c
	- kern/thread_create.c
	- kern/thread_migrate.c

	- mm/vmm.c : vmm_broadcast_inval Never used!!
	- cluster.C : cluster_do_key_op Never used!!

do_syscall & schedule notify the events 
also done by the thread manager (which is waked up by do_interrrupt) and thread idle 



