Revert "ILL: first attempt at borrower based..."

This reverts commit a954ba176b7781330adfd64f296510107e23cd98.

ILL is being demo-ed and this functionality does not yet work.
ILL: improve look of admin page.

* koha-tmpl/intranet-tmpl/prog/en/modules/ill/ill-requests.tt: use table
  layout more consistently.
ILL: implement "edit" link in admin template.

* koha-tmpl/intranet-tmpl/prog/en/modules/ill/ill-requests.tt: implement
  "edit" link; create "edit" form.
* ill/ill-requests.pl (msg): handle "edit" request.
* Koha/ILLRequest.pm (getFullDetails): new procedure.
* Koha/ILLRequest/Status.pm (getFullStatus): update return format.
  (getSummary): add "id" field.
  (new): add "id" field.
ILL: template tweaks.

* koha-tmpl/intranet-tmpl/prog/en/modules/ill/ill-requests.tt: add 'id'
  attribute to search form.
ILL: expose Request variant for editing.

* Koha/ILLRequest.pm (getForEditing): new procedure.
* ill/ill-requests.pl: use it.
* koha-tmpl/intranet-tmpl/prog/en/modules/ill/ill-requests.tt: parse new
  Request format returned by "edit" operation.
ILL: implement mock "edit" submission actions.

* ill/ill-requests.pl: mock handle post-edit request_type.
* koha-tmpl/intranet-tmpl/prog/en/modules/ill/ill-requests.tt: add
  post-edit form.