Merge pull request #283 from olivierbeytrison/master

rlm_ldap : fix wrong filter in group check
Fix typo, add more documentation
Fix typo in define
Rearrange dhcp / vqp dictionary things.

The new conf file parser requires that the dictionaries are
loaded BEFORE parsing the config files.  So we can't dynamically
load dictionaries based on the conf-file contents
Use WARN / ERROR for debug messages
Less complaints about old-style use of attribute references