Reconnect bbackupquery automatically, or at least have a "connect" commadn to do so from inside

[achim]

After the connection between bbackupd and bbackupquery times out, the user gets a cryptic error message and is left with a program that has no functionality.

Improvements (in order of preference):

• Keep connection alive
• Reconnect automatically
• Have a "connect" command that lets the user re-connect manually
• Improve the error message and explain to the user that he has to relaunch bbackupquery
• Close program on loss of connectivity