Manual.rst: Updated doc for a) config.qfq.ini: LDAP_1_RDN, LDAP_1_PASSWORD, b) Form.parameter|FormElement.parameter: ldapUseBindCredentials
ErrorHandler.php: removed details - the end user should not too many details.
FormAction.php, Ldap.php, QuickFormQuery.php: implement 'ldapUseBindCredentials'
Ldap.php: set_error_handler() to catch ldap_bind() problems. Always set LDAP_OPT_PROTOCOL_VERSION=3 - this might cause problems with som LDAP Servers - we will see.