A.k.a. PDL-2.007 pre-release 2.

This continues the countdown to the planned 14-Oct
release of PDL-2.007 with 64bit index support.

Feedback and test reports welcome!
Chris Marshall and the PDL Developers

Release Notes for PDL 2.006_91 --------------------------

 +---------------------------------------------------------------+
 | BE WARNED:  This release includes an update to the internal,  |
 | C-level PDL API for PDL versions 2.006 and earlier.  This     |
 | will require that you re-build any PP or XS modules.  Do not  |
 | upgrade or install over an existing PDL installation unless   |
 | you are prepared to do so!!!                                  |
 +---------------------------------------------------------------+

General Notes:

 * A.k.a PDL-2.007 pre-release 2

 * Another quick CPAN developers release

   - It is a snapshot of the current git development tree
     and everything may not work correctly or have complete
     documentation.

   - These release notes may not be fully complete.  Please
     see Changes (from the git log) for full details.

   - All tests may not pass, especially ones corresponding
     to issues in Known_problems.

   - Manual build/install is recommended although the
     cpan shell may be used by specifying the distribution
     path rather than just the module name, e.g.:

       cpan> get  CHM/PDL-2.006_91.tar.gz
       cpan> make CHM/PDL-2.006_91.tar.gz
       cpan> test CHM/PDL-2.006_91.tar.gz
       cpan> look CHM/PDL-2.006_91.tar.gz

Highlights:

 * ExtUtils::MakeMaker required version is now 6.56 to enable
   use of the CONFIGURE_REQUIRES option (which has been standard
   in perl Core modules since perl-5.12.0 in 4/2010.

 * Fixed some missing conversions to 64bit index support in
   PDL::Primative: vsearch, which, which_both.  Thanks to
   Edward Baudrez for reporting the problem.

 * Replace equality tests by tapprox() ones for some failing
   floating point tests in t/ufunc.t.

 * Code cleanup of some leftover 64bit index experiments.

 * Added 'afh" option to rfits to allow explicit use of legacy hash
   parser for performance reasons.

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