djot-0.1.0.0: test/insert_delete_mark.test

```
This is {-deleted
_text_-}. The braces are -required-.
And they must be in the -}right order{-.
.
<p>This is <del>deleted
<em>text</em></del>. The braces are -required-.
And they must be in the -}right order{-.</p>
```

```
{+ Inserted text +}
.
<p><ins> Inserted text </ins></p>
```

Interaction with smart:

```
{--hello--}
.
<p><del>-hello-</del></p>
```

```
This is {=marked *text*=}.
.
<p>This is <mark>marked <strong>text</strong></mark>.</p>
```