possible bugs, ticket pre-candidates and the like:

• when creating a new invoice, if the details of an already existing client are used, a duplicated client is created. still don't know how to reproduce it. when removed those extra clients, the system says it can not do it, but the are no longer shown. on the database, that corresponds to created records with empty fields.
• some research should be done about the siwapp memory requirements. specially in pdf generation. looks like 32M is not enough.