BTW, I tried to call the pandoc.TableBody() constructor, but that throws an error as it doesn't seem to be defined ("attempt to call a nil value (field 'TableBody')")

```
local caption = {long = {}}
local colspecs = {{pandoc.AlignLeft, pandoc.ColWidthDefault},
{pandoc.AlignDefault, pandoc.ColWidthDefault}}
local head = pandoc.TableHead()
local cell1contents = { pandoc.Plain({pandoc.Str("cell1")}) }
local cell2contents = { pandoc.Plain({pandoc.Str("cell2")}) }
local cell1 = { alignment=pandoc.AlignDefault, contents=cell1contents, col_span=1, row_span=1 }
local cell2 = { alignment=pandoc.AlignDefault, contents=cell2contents, col_span=1, row_span=1 }
local row1 = { cells={pandoc.Cell(cell1), pandoc.Cell(cell2)} }
local rows = { pandoc.Row(row1) }
local bodies = { body=rows, head={}, row_head_columns=0 }
local foot = pandoc.TableFoot()
local mytable = pandoc.Table(caption, colspecs, head, bodies, foot)
table.insert(doc.blocks, mytable)
```