Adds a global status method in the GlobalStatusService.

	modified:   src/net/java/sip/communicator/impl/globaldisplaydetails/GlobalStatusServiceImpl.java
	modified:   src/net/java/sip/communicator/impl/gui/main/presence/AccountStatusPanel.java
	modified:   src/net/java/sip/communicator/impl/gui/main/presence/GlobalStatusSelectorBox.java
	modified:   src/net/java/sip/communicator/service/protocol/globalstatus/GlobalStatusService.java