Bugfix: machine identification numbers were invalid due to the way the master_host was handled. Bugfix: changing the pstate of a sleeping machine was forbidden. Bugfix: switch_on_machine_process and switch_off_machine_process calls were inverted. Bugfix: private attribute id of hosts were called. Bugfix: in switch_on_machine_process, the wrong pstate was used to access to the virtual SWITCH_ON pstate in the sleep_pstates map. Bugfix: static arrays were used for computing the virtual task associated with every SWITCH_ON or SWITCH_OFF.