Use a condition variable to coordinate inter-thread-locking.

While here, correct the way of getting the error message in case
pthread_create(3) fails (it's wrong to use errno here, the return
value from pthread_create(3) should be used instead).
Adding clarification to TN3270 Dissector

adding some comments and output information to make it clear that a z/OS TSO logon has been found as previously it was unclear what the username/password is for (it simply displayed the IP and found userid/password). 
Update to etter.conf to contain TN3270 dissector

The TN3270 protocol for mainframes runs on port 23 (cleartext) and port 992 (SSL Encrypted). This update is to add those two items to the current etter.conf. 
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Merge remote-tracking branch 'origin/upstream' into upstream
Merge pull request #82 from barak/upstream

man page dash slash hyphen smash
Merge pull request #81 from mainframed/master

Changes to TN3270 Dissector to clarify what it's getting and updates to ettercap.conf to add default z/OS TCP ports
Merge pull request #79 from LocutusOfBorg/master

Bumbed version number
Merge pull request #76 from mkilian/cond_var

Use a condition variable to coordinate inter-thread-locking.