Log Message:
update to 4.6.0
changes:
- New syntax supporting multi-line blocks of code delimited by curly braces
     if (<cond>) { ... } else { ... }
     do for [<iteration-spec>] { ... }
     while (<cond>) { ... }
- Time formats can handle fractional seconds to microsecond precision.
- User-definable linetypes that can be used to establish a locally
  preferred default sequence of colors or dash/thickness/point styles.
- Statistical summary of the data to be plotted (new command "stats")
- New terminal drivers:  qt  context  epscairo  cairolatex
- Improved support for UTF-8, SJIS and other multi-byte encodings

pkgsrc change: added "qt4" and "wxwindows" options (not enabled
 by default)