Added `colspan` support for simple tables. An extra colspan is added for each duplicated `||` separator.
Syntax: {{{ || col |||| title (colspan 2) || || a || b || c || |||||| last row (colspan 3) || }}}
This syntax is compatible with MoinMoin:HelpOnTables.
Closes #1293.
Authored by: cboos 2009-10-26
Parent: [r8697]
Child: [r8699]