Change default autogen storage location to /tmp
Change default autogen storage location to /tmp

Default to the univerally available location /tmp for "local"
storage of auto-generated source files.  This default can be
overridden by the end user at any time through the preferences
dialog. /tmp is chosen to allow gscope to function "out of the box"
without any user pre-configuration.

tefletch/gscope,tefletch/gscope