Thing left to do to implement the new reduction API in Cactus:

1. Finish LocalReduce
2. Convert flesh
3. Convert PUGHReduce
4. Convert CarpetReduce
5. Help Matt Anderson and David Fiske converting Taka and Parca



1. Finish LocalReduce

The basic structure of the thorn is complete.  However, the thorn is
completely untested.  Some test suites are necessary.  This is
probably only possible after implementing the flesh changes.

While implementing the API, a minor problem appeared.  Several
reduction operations may be requested at the same time.  These may
have different types.  The callback interface to the global operator
cannot handle multiple types at the moment.  We discussed this, and we
decided to pass the information back to the global operator in arrays
instead of as a single entry in the option table.  This has not yet
been implemented.

Some files contain notes and to-do items.



2. Convert flesh

I didn't want to implement the necessary flesh changes in the flesh,
hence I made copies of the corresponding flesh routines in this thorn
with a CCTKn_ prefix.  This is located in the files flesh.h and
flesh.c.

The flesh changes should be straightforward.  They concern mainly
changing the routine prototyptes.



3. Convert PUGHReduce

I suggest to place a working copy of PUGHReduce into AlphaThorns.  No
work has been done on PUGHReduce.



4. Convert CarpetReduce

No work has been done on CarpetReduce.



5. Help Matt Anderson and David Fiske converting Taka and Parca

Matt and David are probably not aware of our planned changes.