- add phpdoc comments, so the doc generator can pick this up
 - offload timezone handling to where it is used, so we dont need
   to think about SQL and display dates differently, only on action
 - fix up localization for days with posts title attribute
 - use the months with posts meta information we had but throwed away

use 12 SQL queries instead of the one using FROM_UNIXTIME(), since it is timezone affected (and there does not seem to be a good cross-dbserver way to set that timezone)
also fix the query retrieving the posts

issue: #29676 patch suggestions by oishi

 - folder part of oishi's patch into the module (timezone fixing)
 - support for postgresql with using the extract() SQL function, and
   adding the from_unixtime() function to postgres setups
 - document how dates are handled by Drupal and consequently by this module