changelog all the things
Revert "use CPAN::Meta::Merge to preserve all meta fragments while merging"

This reverts commit f8380281efaf31b68ce3711de45f174d7400dfb7.

Conflicts:
	Changes
v5.021

        - improve authordeps' ability to cope with version requirements and
          non-default plugin names
        - a few improvements to help given by "dzil help COMMAND"
        - fixes a situation where exclusion-regexp-building in GatherDir
          could mangle the given regexps
        - now properly merging distmeta fragments together without loss, using
          new CPAN::Meta::Merge (Karen Etheridge)
        - [PkgVersion] now properly skips over $VERSION assignments in
          comments (Karen Etheridge, github #322)
        - the building of manpages is supressed in [MakeMaker]-driven builds
        - lazily load quite a few more modules
        - avoid using user's ~/.dzil even more
        - while building dists for testing, don't bother building man pages
        - try harder to notice minimum required perl version
        - try harder to delete temporarily directory at the end of testing
        - don't treat $VERSION assignments in comments as $VERSION assignments
        - listdeps now takes --omit-core to skip core modules
        - don't try to use terminal encoding on locale-free systems
        - suggest the use of PPI::XS
        - speed up and debug behavior of GatherDir