Multi-bodies tables

[e-picas]

Tables with multi-bodies are not parsed ; only the first body is parsed.

Example (from the demo/MD_syntax.md):

|             | Grouping                    ||
First Header  | Second Header | Third header |
------------- | ------------: | :----------: |
Content Cell  |  *Long Cell*                ||
Content Cell  | **Cell**      | **Cell**     |

New section   |   More        |         Data |
And more      |           And more          ||