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  - Added the remove_row and remove_col functions.  Also made all
    three of the above functions capable of taking arguments at
    run time as well as compile time.

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functions.  It was possible that you could get incorrect results
if you used these functions to copy one part of a matrix to another
part of the same matrix if the two areas overlapped.

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when compiled.  This avoids problems in compilers like visual studio.

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Also suppressed some compiler warnings.

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assign a matrix of matrices to another matrix of matrices so long
as long as the assignment makes sense.  Previously you were only
allowed to perform this assignment if the inner most matrix types
were exactly the same.

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user hits enter and another for detecting when input focus is lost.

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a derivative function.

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function.

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