Value: tweak migrate_value to always return something, even undef.
Value: removed dead check_warp_keys function (dead for 7 years ..)
v2.058

    Bug fix release

    * cme: modify cryptic user message about "Fixing stuff"
    * Value: tweak migrate_value to always return something, even undef.
      This fixes 'cme check dpkg-copyright' crash (thanks gregoa)
    * Loader: fix pod doc about list operators
    * AnyThing: avoid undef warning that breaks test on freebsd perl 5.10.1