[7.0, trunk] Icon path in ir_module_module table longer in ORM than in base.sql

I have a custom module with a technical name longer than 40 characters. It has an icon in static/src/img/icon.png. I can add the module to the addons path of an existing database, but I cannot create a new database if the addon is already in the module path.

This will lead to the following error:

  File "openobject-server/openerp/sql_db.py", line 226, in execute
    res = self._obj.execute(query, params)
DataError: value too long for type character varying(64)

Analysis: although the length of the 'icon' field (containing the full icon path including the module directory name) is 128, its length in base.sql is still only 64. The path of my module's icon is 66 characters long, and this halts the database creation process.

Proposed solution: adapt the length of the field in base.sql to the length of the field in the model definition.