[Kst] extragear/graphics/kst/kst

[Rick Chern]

SVN commit 450634 by rchern:

allow perfectly horizontal/vertical lines/arrows

 M  +7 -0      kst.cpp  
 M  +4 -0      kst.h  
 M  +15 -4     ksttoplevelview.cpp  
 M  +34 -10    kstviewarrow.cpp  
 M  +26 -4     kstviewline.cpp  
 M  +3 -1      kstviewline.h  
 M  +7 -2      kstviewobject.cpp  
 M  +1 -0      kstviewobject.h