How to install this:
 
1) Follow the directions for "MAKING YOUR OWN SYNTAX FILES" in:
 
     http://vimdoc.sourceforge.net/htmldoc/syntax.html#mysyntaxfile
 
   These instructions essentially say to copy the syntax file (jam_mr.vim)
   to $(HOME)/.vim/syntax if you're on Unix.  If you're not, do what the
   document suggests.
 
2) Let vim know how to identify Jam files.  General info on how
   to identify files is here:
 
     http://vimdoc.sourceforge.net/htmldoc/filetype.html#new-filetype
 
   Here's the command which I put in my $(HOME)/.vim/filetype.vim file:
 
      " Jam/MR
      au BufNewFile,BufRead [Jj]amfile,Jamrules,Jambase setf jam_mr 
 
   This works under Vim 6.0 and I would expect it to work under other
   versions.
 
Happy Jamming!
 
   -Chris