psi: add support for complex numbers. * libinterp/corefcn/psi.cc: add logic and input check to support complex numbers (implementation is in lo-specfun.cc). Add tests. * liboctave/numeric/lo-specfun.cc, liboctave/numeric/lo-specfun.h: add template specialization to psi() for std::complex. It is mostly taken from the implementation in XLiFE++ (also under GPLv3+, see b03c7cccadc2 commit message for more details).

#! /bin/sh

set -e
GREP=${GREP:-grep}
SED=${SED:-sed}

srcdir="$1"
shift

for arg
do
  if [ -f "$arg" ]; then
    file="$arg"
  else
    file="$srcdir/$arg"
  fi
  if [ "`$GREP -l '^%!' $file`" ]; then
    echo "$file" | $SED "s,\\$srcdir/,,";
  fi
done