CCA object interface for linear algebra objects

  Desires:

     Support users in Fortran, C, and C++. 

     Allow users in each language to do things "naturally" in that language, i.e.
        C++ users should have classes 

     Allow the same application to use some objects written in C and some written in C++

     Allow users to determine whose objects they use at RUN time; i.e. you cannot resolve
        function names at compile time!

     Any toolkits vectors MUST work with other components from other toolkits.

    
  CCA Approach:

     There are NO stand-alone functions, only operations we can call on objects.

     Objects are natural for a particular language i.e. classes in C++, structs in C,
         derived data types in F90.

     Each object type, like vector, has wrappers that can make it look like 
         a native C, C++ or Fortran 90 object.

         For example:

             class CCA_CPPVector;  
                 - C++ vector object 

             typedef struct _CCA_CVector *CCA_CVector; 
                 - C vector structure
           
             CCA_CPPVectorC(CCA_CVector) 
                 - returns a C++ vector object wrapper from a C vector object

             CCA_CVectorCPP(CCA_CPPVector,CCA_CVector*) 
                 - returns a C vector object wrapper from a C++ vector object

  Include file organization:

     cca_c*.h - header files for C interface

     cca_cpp*.h - header files for C++
  
     cca_c_cpp*.h - header files for wrappers between C and C++ (both directions)