Changes in global.conf.dist from Release 2.4.5 to 2.4.7

There are only a few additions to global.conf.dist for release 2.4.7.

Add standard locations to search for macros in the NationalProblemLibrary

#
#  The macro file search path.  Each directory in this list is seached
#  (in this order) by loadMacros() when it looks for a .pl file.
#
$pg{directories}{macrosPath} = [
   ".",                     # search the problem file's directory
   $courseDirs{macros},
   $pg{directories}{macros},
   "$courseDirs{templates}/Library/macros/Dartmouth",
   "$courseDirs{templates}/Library/macros/Union",
   "$courseDirs{templates}/Library/macros/NAU",
   "$courseDirs{templates}/Library/macros/Michigan",
];

Added JavaApplet module to list of modules to be loaded

# The first item of each list is the module to load. The remaining items are
# additional packages to import.
${pg}{modules} = [
..............
	[qw(Applet FlashApplet JavaApplet)],
];

Some minor spelling errors were corrected and comments were added.