Patch for complex streaming

[Petter Urkedal]

At the moment the complex streaming operators does not make it
into the library, since they depend on template parameters.
Further, input is only a stub.  The Attached files

  src/complexio.cc
  testsuite/26_numerics/complexio_input.cc

and the patch should fix this.  Please note:

-- Since the stream operators have a different character than
the rest of the operators in `src/complex.cc' -- they depend on
more template parameters, and their specializations for float,
double and long double needs no special treatment -- I decided
to move them into a separate file `src/complexio.cc'. OK?

-- At present all instantiations are in one file.  Do you think
we shall split them into a dozen of file like done for the string
stuff?

Requests?  Otherwise,

2000-02-12  Petter Urkedal  <petter@matfys.lth.se>

        * std/complex.cc (operator<<, operator>>): Moved from here...
        * src/complexio.cc: ...to new file.
        (operator>>): Stub replaced by the real thing.
        * src/Makefile.am (sources): Inserted complexio.cc.
        * testsuite/26_numerics/complexio_input.cc: Check it.

Cheers,
 -petter.