@var just became @mvar in the texinfo documentation

To make the info documentation compile correctly with Texinfo 5, I went
through and fixed all the warnings we were getting. The first one that
crops up is actually a bit of a problem: basically, we were defining
@var to surround its argument with "<" and ">". All very well, but
Texinfo all ready has a meaning for @var.

There were two obvious ways to find a solution. Firstly, we could try to
undefine Texinfo's definition of @var. I'm not sure I have the
Texinfo-fu to do that correctly. Another option is to rename the thing
we've been using to something like @mvar{}. Which is what I did.

There's a terrifyingly large commit which switches over to the new
name. I did the renaming with the command:

  sed -i 's/@var{/@mvar{/g' $(fgrep -lr '@var')

Not particularly clever, but everything seems to work afterwards.

So basically, I thought I'd better send a message to tell anyone writing
documentation that they want @mvar instead of @var now. If you really
hate the extra character, we can always try the first approach I
mentioned above and revert this commit again.


Rupert
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