- added some comments - the "updating modules list" log appears only when actually updating the list - similar code to read the module descriptor file is combined - default values for some descriptor entries are given only once - in particular, the default version is always 0, instead of 0 when reading a descriptor for migration and 1.0 when writing its value in database. bzr revid: vmt@openerp.com-20110511103455-lqezcrjf2996j7mc