Add parameters to set the origin of the excision region for "fixed

excision".

When checking for (real-valued) mask values, do not check for
equality, but instead allow for a fudge factor.

Check that the thorn is activated when any of its routines are called.

When there is only a single point excised, do not abort with an
internal error, but pretend the normal extends into the x direction.


git-svn-id: http://svn.einsteintoolkit.org/cactus/EinsteinEvolve/LegoExcision/trunk@42 f75ba9e5-694f-0410-ac2c-87ea7ce7132b

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