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Commit from logg (2005-09-06 23:45 CEST)
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Compute signatures of terms to identify terms that have a common
tensor representation, so that the reference tensor can be factored
out. Signatures (which are strings) can be either hard (unique) or
soft. Indices of terms with a common soft signature can be reordered
to obtain common hard signatures.

  ffc  src/ffc/compiler/compiler.py   1.20
  ffc  src/ffc/compiler/form.py       1.13
+ ffc  src/ffc/compiler/reorder.py    1.1
+ ffc  src/ffc/compiler/signature.py  1.1
  ffc  src/ffc/compiler/term.py       1.2