2. added SHAREDIR, BINDIR, LIBDIR, and MANDIR optional parameters to install/uninstall scripts
3. added SHAREDIR, BINDIR, LIBDIR, and MANDIR as makefile install options
4. re-factored Installation Directory search code. Previously, it searched in this order:
A. directory specified on command line with --installdir
B. $PREFIX/share/mupen64plus with $PREFIX given at compile time
C. same directory as the mupen64plus binary
D. current working directory
The new code searches in the following order:
A. directory specified on command line with --installdir
B. same directory as the mupen64plus binary
C. /usr/local/share/mupen64plus
D. /usr/share/mupen64plus
E. current working directory
5. Added PluginDirectory parameter to mupen64plus.conf file and necessary handling code in main.c