preferences naming is not ldap compliant.

[KaalH!]

hi, 

I'm using the latest cvs version oh horde/imp/turba..... 
I use openldap 2.x as auth/prefs backend. 

There is some trouble with the naming conventions : 

- most preferences contains underscores 
- in kronolith, the '24hr' pref start with a number 

ldap attributes cannot contain _ or start with numbers (at least with 
openldap2.x). 

I've patched my Prefs/ldap.php for stripping underscores from prefs names ... 
it's really ugly :( 
  
I thing establish a naming convention for prefs names w/o underscores or 
starting with numbers, compliant with other prefs backends, (something 
like 'sigFirst' instead of 'sig_first', 'hr24' instead of '24hr' ...), is 
needed. 

what about this ? 
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