* Finish conversion of demo x09.pl.

* Convert demos x03c.c, x04c.c, x05c.c, x06c.c, x07c.c, x08c.c, x10c.c,
  x11c.c, x12c.c, x13c.c, x14c.c, x15c.c, x16c.c, x17c.c, x18c.c, x19c.c.

* PLplot.i.in: 

  + General cleanup; add comments; choose more consistent names for the
    internal functions.

  + More robust use of perlguts: instead of using SvTYPE (sv) and testing
    for SVt_*, use S*OK functions.

  + Free malloc'ed memeory, everywhere it is necessary.

  + Support for bi-dimensional piddles.

  + Write lacking typemaps.

* Makefile.PL.in: Add installation support from MakeMaker.  (See
  http://people.debian.org/~bod/perl-policy/ch-module_packages.html for
  hints.) 

* Integration into PLplot configuration scheme in two steps:

  + step 1: Create a local configure.in.  Test for availability of perl,
    swig, PDL module, etc.  Substitute locally several variables (@PERL,
    @HAVE_PDL@, @PDL_INCDIR@).  Take inspiration from
    doc/docbook/configure.in. 

  + step 2: Integrate into cf/configure.in, testing for $enable_perl.

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