Implement custom account field deletion

Custom account fields can now be deleted either one at a time via id or
all fields owned by an account

storage/userInfoFields.go

@@ -55,3 +55,16 @@ func (s *Storage) AddNewUserField(name, value, belongsToId string) (*UserInfoFie
 	// TODO: Implement me
 	panic("Not implemented")
 }
+
+func (s *Storage) DeleteUserField(id uint) error {
+	defer util.Untrace(util.Trace(&log.Logger))
+	return s.db.Delete(UserInfoField{Model: gorm.Model{ID: id}}).Error
+}
+
+func (s *Storage) DeleteAllUserFieldsForAccountId(id string) error {
+	defer util.Untrace(util.Trace(&log.Logger))
+	return s.db.Model(&UserInfoField{}).
+		Where(&UserInfoField{BelongsTo: id}).
+		Delete(&UserInfoField{}).
+		Error
+}