Matching the method signatures in the README.

And adding the license statement to the header file.
No need for the log_file.
Overload was ambiguous.
Fixing plainTeX link.
Removing unused I/O methods.
Removing extra newlines left by the use of the C preprocessor.
Use the std::iostream methods directly.

Most of the methods wrapping the std::iostream in a FILE * style API have been removed.

Additionally, p2c had truncated some string literals to single characters. The configuration value for this changes by-passes that bug.