* Changed the hard coded cache limit in llappviewer.cpp to 10GB as well as the
   slider maximum in the preferences menu. * The VFS cache is capped at 1GB due
   to file system limitations. The former 80/20 split between texture/vfs is
   maintained up to 5GB. Above this limit the texture cache is given all
   the additional cache space up to 10GB.
 * Fixed a log message in lltexturecache.cpp that was not showing the correct
   texture size. ER-883
 * Fixed a bug in llfloaterpreference.cpp that caused new cache value to be
   written to the old cache setting. This resulted in the the cache not being
   cleared when the location was set back to the default. ER-882
 * Disabled the "The cache will be cleared on reboot" message that is triggered
   by the reset button in the cache preferences in the case where the cache
   is already located in the default location.  The cache is only cleared when
   its location is changed. This is intended to address resident confusion
   regarding the purpose of the reset button, as demonstrated in VWR-19562.