jordi fita mas ad5bc271b6 Add the payments section
This actually should be the “payments and receivables” section, however
this is quite a mouthful; a “receivable” is a payment made **to** you,
therefore “payments” is ok.

In fact, there is still no receivables in there, as they should be in
a separate relation, to constraint them to invoices instead of expenses.
It will be done in a separate commit.

Since this section will be, in a sense, sort of simplified accounting,
i needed to introduce the “payment account” concept.  There is no way,
yet, for users to add them, because i have to revamp the “tax details”
section, but this commit started to grow too big already.

The same reasoning for the attachment payment slips as PDF to payment:
something i have to add, but not yet in this commit.
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