DRUPAL-5--1-1
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Allow user to control the location of PEAR.php and Tar.php if not found in expected locations.
Checks to see that PEAR.php and Tar.php have been found - does not permit backup if not found.
If the system temp directory is in the system file directory - does not backup the backup file (!!) 
Bug when obtaining system name fixed

DRUPAL-5--1-0
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Initial build
