[PATCH] Small fixes to the Perl bindings

Hi,

while trying to use svn_wc_parse_externals_description3 from Perl I
stumbled over a fex things.
Patches below are against trunk.

perl-bindings-1.patch

[[[
Make svn_wc_parse_externals_description3 available from Perl bindings.

* subversion/bindings/swig/include/svn_containers.swg:
  Add output typemap for APR array of svn_wc_external_item2_t.

* subversion/bindings/swig/perl/native/Wc.pm:
  Document function svn_wc_parse_externals_description3.
  Add the magic to access struct svn_wc_external_item2_t
  as an object and document its methods.

* subversion/bindings/swig/perl/native/Core.pm:
  Fix a typo that prevented the use of
  _p_svn_opt_revision_value_t objects.
]]]

perl-bindings-2.patch

[[[
Replace inline typemap with a function.

* subversion/bindings/swig/include/svn_types.swg:
  The bulky input typemap for svn_opt_revision_t is inlined
  by Swig for each use in the generated Perl bindings.
  Move its body ...

* subversion/bindings/swig/perl/libsvn_swig_perl/swigutil_pl.c
  (svn_swig_pl_set_revision): ... to a new function here.

* subversion/bindings/swig/perl/libsvn_swig_perl/swigutil_pl.h:
  Add function prototype.
]]]

perl-bindings-3.patch

[[[
Documentation fix for SVN::Ra.

* subversion/bindings/swig/perl/native/Ra.pm
  Fix examples: the $path parameter for SVN::Ra::get_dir() and
  SVN::Ra::get_file() must not start with a slash.
]]]

Cheers, Roderich