Fix is_valid_rr_cname_name behaviour
Add extra use_ldap column into users tables.
Add SQL scripts for updating to poweradmin 2.1.7

I'm not sure if there have been other schema changes that also need adding.
I've only done mysql and postgresql.
Only display links to changing your own password if you're not an ldap user.
Introduced ldap_use config variable, this protects current users from fatal failure after upgrade if they forget to update database
Merge pull request #139 from alexjfisher/ldap-sql-changes

Ldap sql changes
Updated insert statement for sqlite database required after added ldap field.
Added sqlite migration file (just in case)
Merge pull request #129 from neatbasis/master

Fix is_valid_rr_cname_name behaviour
Display LDAP checkbox only if ldap is enabled from config
Merge pull request #140 from alexjfisher/issue132

Stop LDAP users from trying to change their own passwords.
Updated insert statement after added ldap support