Markdown filter: only one line is quoted after extract/merge of multi-line quotes

*Created by: Kuro Kurosaka *

The attached file, quoted-list.md, has the three list items that are quoted by "> ". When this file is extracted and remerged (by tikal.sh -x and tikal.sh -m), the re-generated .md has the quote only in the first line, as shown below.

> 1. Drag the asset to the required location in the assembly and select once using the left mouse button.
1. If multiple insertion points have been defined on the model, press the Tab key to cycle through each of the insertion points until you identify the point you want. To automatically place and ground the asset at the layout origin (0, 0, 0), right-click when placing the asset and select **Insert Grounded at Origin**.
1. Continue to move the mouse to rotate the asset, or enter an angle in the value input box. Select again using the left mouse button to define the orientation.