Updated the auto_avgerager subroutine

git-svn-id: https://svn.mcs.anl.gov/repos/nek5/trunk/nek@1009 24248562-e74d-0410-ab4b-d4d80c744c73
Updated all .rea files and to set p66/p67 to 6 and changed Nek to default p66/p67 to 6 unless using .usr file to edit parameters. ONLY postx/postex will read form from .rea file. N2to3 handle different temp BC, for nel=nelv only. Minor BB update

git-svn-id: https://svn.mcs.anl.gov/repos/nek5/trunk/nek@1010 24248562-e74d-0410-ab4b-d4d80c744c73