Improved Signatures

Signature requests show the next step and the document

A signature request page says what to do next, shows the document with its fields, and adds signers without reloading.

A signature request page now says the next step at the top: add signers, place their fields, then send. The document is shown on the page with every placed field outlined in its signer's colour.

Signers are added by email address, with suggestions from Contacts, and without reloading the page. The name is optional: a matching contact's name is used, or the part of the address before the @. An access code is set from the More menu on a signer's row. Settings use the same rows and menus as other Magpie settings.