* Added options for the graph width and filtering on marker name to
  Samplevis and Profilevis.
* The text fields in the HTML versions of Samplevs and Profilevis
  now update the graph OnChange instead of OnKeyUp. This is done
  because rendering the graph takes a while with large data files.
* Fixed glitch in Profilevis that caused useless horizontal axis
  labels when the logarithmic scale is used.
* Fixed glitch in Profilevis that caused Vega to render the graph
  even before data was loaded.
* Changed -R option of SeqConvert to -r to avoid a potential
  collision with the -R/--report option if SeqConvert ever gets
  report output support in the future.