Merge pull request #2521 from kurund/CRM-14181

CRM-14181, migrate enum to varchar

diff --cc CRM/Core/PseudoConstant.php
Simple merge

diff --cc CRM/Group/Form/Edit.php
Simple merge

diff --cc CRM/Member/Form/MembershipType.php
Simple merge

diff --cc api/v3/Generic.php
Simple merge

diff --cc api/v3/utils.php
Simple merge