#1 Check return codes everywhere

[Markus Elfring]

Some checks for return codes are missing.

Examples:
Would you like to add more error handling for return values from "pthread_mutex_init" like in a constructor and from "pthread_mutex_lock" in the member function "Store::setStatus"?
http://scribeserver.svn.sourceforge.net/viewvc/scribeserver/trunk/src/store.cpp?revision=3&view=markup
http://scribeserver.svn.sourceforge.net/viewvc/scribeserver/trunk/src/store_queue.cpp?revision=3&view=markup