Revert "Disallow POW blocks after 30K and fix broken POS"
Revert "Disallow POW blocks after 30K and fix broken POS"

This reverts commit 5fdaad0e888b32e2566bbfc8345bd0ec0b47080a.

coinkeeper/2015-06-22_19-13_whitecoin,coinkeeper/2015-06-22_19-13_whitecoin,coinkeeper/2015-06-22_19-13_whitecoin,coinkeeper/2015-06-22_19-13_whitecoin