reorganize the way we do the initial data setup:

Previously we did it one, using a routine called dirctly from the Cactus
scheduler.  This worked ok, but...  if we tried to find an AH and failed
due to the trial horizon surface falling off the edge of the grid, the
next time we tried to find that horizon the surface would again be off
the edge of the grid, so the finding would fail again, ... and again ...,
i.e. we'd never again be able to find that horizon.  Ths was ++ungood.

So... this checkin changes the semantics so that each time we try to find
an AH, we first test whether we need to (re)set an initial guess first.
The test is that if we succeeded the most recent preceding time we tried
to find this AH, then we use that AH position as our initial guess this
time.  Otherwise (i.e.if this is the first time we'vetried to find this
AH, or if we've tried before but failed on our more recent preceding
attempt), we (re)set the initial guess.


git-svn-id: http://svn.einsteintoolkit.org/cactus/EinsteinAnalysis/AHFinderDirect/trunk@802 f88db872-0e4f-0410-b76b-b9085cfa78c5

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