[SAC] OSGeo LDAP stats

[Sandro Santilli]

As I checked to determine how expensive it'd be to automatically create
a Gogs account for each OSGeo user [1] I'll report some stats from the
LDAP database:

 - Currently registered users: 20715
 - Unique registered emails:   19935 (780 duplicated email)

 - Users registered in 2014:    2595
 - Users registered in 2015:    6670
 - Users registered in 2016:    2121
 - Users registered in 2017:     172 (up to April 10)

 - Different mail domain used:         5201
 - Mail domains used by a single user: 4374

 - Different .gov mail domains:   48
 - Users with .gov mail address: 114

 - Different .edu mail domains:  194
 - Users with .edu mail address: 287

 - Users with username only composed by numbers: 254
 - Top 20 most used mail domains (spammers most likely still hiding here):

    users domain
    ----------------------
     7195 gmail.com
      949 yahoo.com
      740 hotmail.com
      234 googlemail.com
      225 web.de
      200 arcor.de
      197 gmx.de
      192 yahoo.de
      189 t-online.de
      183 bigstring.com
      177 zoho.com
      177 inbox.com
      172 gawab.com
      171 freenet.de
      171 aol.com
      133 gmx.net
      104 autodesk.com
       89 yahoo.fr
       84 163.com
       69 live.com
 
--strk;