Added an option to write out data sources that are in separate sections or files in columns instead of rows.  This is meant for 1D data but there was no issue extending it to other types.  For AMExporterGeneralAscii, it only handles a limited set of data source and scan types.  Incorporated the option into all of the VESPERS exporters except SMAK and added the ability to customize the exporter option in this way to all of the scan configurations, except for VESPERSEnergyScanConfiguration.  Fixes #502.
Merge branch 'master' of github.com:acquaman/acquaman