Completed a long-standing TODO item.  The SOS.Table column heading names are now implemented as an array in the object's table options.  Although this in itself was a simple fix, there were other parts of the table object that assumed only two columns per observed property.  As well as making it easier to rename the columns (e.g., for internationalisation), it now means that the table can handle more that just two columns per observed property; a required mod. for some of the BASMet/WPS integration, where we want to show also an error estimate, as well as the timestamp and value.
Minor bugfix.  Columns are now correctly separated for plain table.
Implemented long outstanding TODO item.  We now include the flot navigate plugin to enable pan/zoom on a SOS.Plot.