addin collection of Ngraph-gtk

 Ngraph is the program to create scientific 2-dimensional graphs for
 researchers and engineers. This program can create advanced graphs
 which can't be created by spreadsheets. Graphs can be exported to
 postscript.
 .
 This package contains the following addins:
 .
  * append: append a NGP-file without clearing the present graph
  * fft: Fast Fourier Transform
  * legend: generate a legend box
  * cal: show calendar in the information window
  * math: calculator
  * text-in: insert a column as legend-text
  * fitrslt: generate a legend box
  * timer: countdown timer
  * img2gra: import a bitmap image
  * load_prm: load an old PRM format file