v3.5.1

New features

• offer wording is data staff can change, and every offer has one table with units (#1316, @spashii)
• staff set vat, currency, terms and discounts, add organisations and revise sent offers (#1317, @spashii)
• an offer carries the customer's reference through signing to its invoice (#1318, @spashii)
• offer lines can be optional or included, and only charged lines count (#1319, @spashii)
• an offer can name another party to invoice (#1320, @spashii)
• an offer can be invoiced monthly or in instalments (#1321, @spashii)
• staff record an offer or dpa accepted outside dembrane, with its evidence (#1322, @spashii)
• offer sections with subtotals, quantities with two decimals, and offers of no charge (#1323, @spashii)
• the customer picks an offer option when signing (#1324, @spashii)
• offers take annex pdfs and a second signature, theirs or dembrane's (#1325, @spashii)

Full Changelog: v3.5.0...v3.5.1