title: How to upgrade OpenERP 5.0 to 6.0
body: <p>I have an OpenERP 5.0 installation with a few custom modules, that I wish to upgrade to OpenERP 6.0.</p>
  
  <p>I have some experience with this kind of sofware and I have inspected OpenERP. Sadly, I don't have actual experience with OpenERP, and I like to ask for some help in order to avoid mistakes. When researching this, I found there are several strategies (ETL processes, data-upgrade modules)...  I assume I'll need to review all custom modules.</p>
  
  <p>What are the guidelines or best practice in order to upgrade an OpenERP 5.0 installation to 6.0?</p>