tighten up entries
backwards compatibility tests are for authors only
eliminate a custom plugin by switching to [DynamicPrereqs]
report on the installed version of these optional prereqs
use [AutoPrereqs], but remove our optional deps
specify the exact version needed in code also
add keywords to metadata
eliminate the use of "use vars"
add contributors to pod too
reduce prereq list down to core only
Hash-Util-FieldHash-Compat-0.08

        - add missing prereq declarations needed for perl 5.6 (RT#97000)