Workable implementation of dropping table thead from table results.

[dbolack-ab]

This adds a new control character for Table headers that drops the thead section from the resulting output.

|!| | |
|-|-|-|
|dasd|asdasd|
|asdasd|asdasdas|

Renders

<table><tbody><tr><td>dasd</td>
<td>asdasd</td>
<td></td>
</tr><tr><td>asdasd</td>
<td>asdasdas</td>
<td></td>
</tr></tbody></table>

Rationale:

This extension requires a header row to parse a table even if the user does not desire one. The current best solution is to CSS the header away.