fix(igroup): Do not show GRP_ADDUSER menu if user has not the "modify" acl (refs #4665)
test(GroupAccount): Test insertDocument() on IGROUP with PDIR (refs #4665)
fix(GroupAccount): Disable edit control before calling RefreshDocUser() (refs #4665)

Disable edit control before calling RefreshDocUser() in postInsertDocument().
Merge pull request #1126 from eguaj/3.3-A4665

fix(igroup): Do not show GRP_ADDUSER menu if user has not the "modify" acl (closes #4665)