More staggered code

I am starting to add all the staggered code that we have
lying around in various sub-directories. I have just checked
in the code, written by Chris Richards, to do variational
smearing of the scalar channel.

I will first add the new code for heavy-light mesons
that is used by HPQCD. I will then add the binary readers
system that the ex-Liverpool group added to inline_spectrum.h,
because of the IO problems on one machine.