Version 2.0beta - Substantial additions and optimisations, compatible with Mathematica 10. 
		  Much of the new functionality unfortunately still undocumented; see
 		  source for details.

Version 1.03: 	- Update in order to make GAMMA compatible with Mathematica V5.0,
		  which evaluates expressions differently from previous versions of
		  Mathematica.

Version 1.02:	- A new command, Multiply[term1,...,termN], is added for
		  multiplying N terms taking into account that some dummy
		  indices may be the same in some terms.
		- A bug leading to a sign error if indices are entered in a
		  non-canonical order in output format is fixed.
		- Significant improvement, regarding both speed and memory
		  consumption, for expressions containing a large number of terms. 
		- RenameDummy has been further improved allowing a more canonial
		  form to be reached for expressions with more complicated
		  structures of dummy indices.
		- A bug that in some cases resulted in an error message when
		  calling GammaExtract is fixed.
		- A bug causing symbolic constants to be dropped in Sym[] is fixed.
		- The names of dummy indices are changed from d1, d2,..., d10,
		  d11,... to d1, ..., d9, e1,... e9, f1,... in order to prevent
		  the dummy indices to be moved around by Mathematica's sort function
		  (i.e. the old list was not sorted with respect to Mathematicas sort
		  function (e.g. d11<d2)). All of the new dummy indices are also
		  two characters long leading to more compact expressions.  
			   
Version 1.01:	- A bug appearing when an expression contains two identical
		  objects, like Tensor[X,{a,b}]Tensor[X,{a,b}], is fixed.
		  (Mathematica in this case automatically replaces Times[]
		  by Power[], which caused some problems.) 
		- RenameDummy has been improved, now producing a more canonical
		  output, thereby recognizing more terms that are equivalent. 
		- TraceGamma has been improved, especially when using the option
		  of specifying antisymmetric indices.
		- GammaTrace does not yield zero when tracing a gamma matrix
		  with the same number of indices as the spacetime dimension
		  when this number is odd. Instead the GammaProd[] is kept and
		  the user can himself replace it with a Levi-Civita tensor
		  density according to his conventions (note that GammaProd[] is
		  _not_ multiplied by the spinor dimension).
		- SCanonicalOrder removes terms which involves the
		  symmetrization of manifestly antisymmetric indices.