Changes for version 1.5
- fix a heap overflow (testcase by Krzysztof Wojtaś).
- on systems that support it (posix + mmap + map_anonymous), allocate all dynamic areas via mmap and put four guard pages around them, to catch similar heap overflows safely in the future.
- find a safer way to pass in CC/CFLAGS to uulib.
- added stability canary support.
- Convert::UUlib - Perl interface to the uulib library (a.k.a. uudeview/uuenview).