[Patches] If clauses in schedule

[Erik Schnetter]

Schedule items in Cactus can have WHILE clauses, which means that they  
are executed while a certain condition are true.  I suggest to add IF  
clauses, which would mean that they are executed only if a certain  
condition is true.  The syntax is equivalent to WHILE clauses.

This is different from the existing if statements, which are only  
evaluated once at startup.  The new if clauses are evaluated every  
time the schedule is traversed.

-erik

-- 
Erik Schnetter <schnetter at cct.lsu.edu>   http://www.cct.lsu.edu/~eschnett/

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