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f2cpp.pl - Converts Fortran 77 code to C++

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Unlike f2c, the output of f2cpp.pl may or may not compile, however,

only a small number of hand-tuned changes are typically needed.

The resulting code is much cleaner than f2c's output, and much closer

to the original intent of the original Fortran code.

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The resulting C++ code is very C-style; we basically only want C++

for its std::complex<> type and operator overloading.

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Assumes single subroutine per file, and that there are

no lines of significance above the subroutine declaration.

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TODOs:

- Make the first step of conversion breaking up the input into chunks

delimited by subroutine boundaries. This will require full on parsing

of blocks.

- Some declarations are generated incorrectly, like IZAMAX, whose array

argument is never an array.

- Fix by-value argument passing of expressions (currently lets through

things like (-&std::conj(tau)).

- Generate proper subroutine declarations for character arguments

(should be const char *, not char).

- Determine const-ness of function declaration parameters through program

analysis.

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