Add check for multi logins, minor bug fixes

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ADDED - Critical-level notification at top and bottom of SSP output when more than one cPanel SSH login (or one of its associates) are detected in 'who' output by matching remote hostname and/or IP address.  This is intended to help prevent conflicts with multiple people working on the same server.  It can't tell the difference between more than one tech logged in and the same tech logged in more than once.

Requested by:
  Chris Borsheim

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FIXED - The backup script PID check wasn't detecting running backup scripts when additional options were used such as "--force", causing a false warning.

Credit:
  Peter Elsner

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FIXED - A couple of PHP5-related uninitialized value warnings which would occur if the php binary was broken.

Credit:
  Mary Wior

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