Convert the project to use the GNU Build System (aka Autotools)
LICENSE was renamed COPYING because otherwise `autoreconf` complains loudly. This is also the reason AUTHORS, INSTALL, and README were created. Man pages were moved into src/pam_panic/man and src/pam_panic_pw/man. Finally, certain variables are passed through the config.h file to the module rather than as -D flags on the command-line.
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