Find 2Checkout orders that were never posted in Dynamics GP

**Objective:** List up to `{max-orders}` (default 25) 2Checkout orders, optionally for billing last name `{billing-last-name}` and with gross price at least `{min-amount}` (default 0), that have no matching sales document in Dynamics GP.

**Step 1: Read orders from 2Checkout**

Call `2checkout-get-order` with `max-records` = `{max-orders}`, adding `billing-last-name` = `{billing-last-name}` only if one was given and `gross-price.min` = `{min-amount}` only if given. Drop orders where `test-order` is true or `approve-status` is not approved, and say how many were dropped.

**Step 2: Look each order up in Dynamics GP**

For each remaining order call `dynamics-gp-get-rm-sales-trx` with `customer-po-number` = the order `reference-number` and `document-date.from` = the order date. If it returns nothing, call `dynamics-gp-get-rm-trx` with the same `customer-po-number`. Record Found or Missing.

**Step 3: Report**

First list the Missing orders (`reference-number`, `order-date`, billing name, `gross-discounted-price`, `currency`), largest first, then give the counts of Found and Missing.

**Rules & Guidelines:**

* `2checkout-get-order` is on the 2checkout server; `dynamics-gp-get-rm-sales-trx` and `dynamics-gp-get-rm-trx` are on the dynamics-gp server.
* Read-only. Do not call `dynamics-gp-rm-sales-trx-add` or `dynamics-gp-rm-trx-add`; this prompt only reports gaps.

**Validation:**

* If `2checkout-get-order` returns nothing, report that and stop.
* If the GP search errors for an order, list it as Unchecked rather than Missing.