added tango colors
first compilable version of of the alphastyle preferences
basicalle the new preferences page is integrated to the dialog
fixed treeview collapsing
progress
added application-visual-style-alpha-checkerboard icon
bugfix
using now by default a darker alpha pattern
added grey color to tango with zero saturation
bugfix
using now the tango icontheme everywhere
added checkerboard style
added wodget representation for differernt styles
improved widget representations
using better checker checkerboard colors
allowing to make color widgets read only
added TODO notes
adde grey
improved almost black
disabled color widget gets faded out