Added a option to specify the temp dir used by the axstore

in nfs/shared stoage systems this enables you to use local storage for the
most of the work. Also in situations where storage is limited you could use
an other patition for temp space.

git-svn-id: https://svn.muze.nl/svn/ariadne-php5/trunk@5546 7882d7ee-46e0-0310-a255-a28a61b628e4