Comments added to ServerQueue, class Server moved inside ServerQueue
	modified:   common.h
	modified:   smbtaskd/serverqueue.cpp
	modified:   smbtaskd/serverqueue.h
TASKSERVICE define instead of hardcoded "2050"
Queue checks the set of servers only once, no message is sent if there are no free servers.
	modified:   smbtaskd/main.cpp
	modified:   smbtaskd/serverqueue.cpp
Merge https://github.com/bankov/u-search
Bugfix: actually return empty string if no free server is found.