[Kst] extragear/graphics/kst/kst

[Rick Chern]

SVN commit 418199 by rchern:

add functions to make psds and histograms without curves

 M  +29 -2     kstiface.h  
 M  +110 -42   kstiface_impl.cpp  
 M  +18 -2     kstiface_impl.h