fixed the AltkGC class
cleaned up AltkWindow class
cleaned up AltkDrawable class
fixed the default box color
Merge branch 'master' into newgc
added the memcheck script
Merge branch 'newgc'
added AltkFont.char_width and altk_label_set_min_chars()
added AltkBox.private
fixed AltkBox.size_request()
fixed AltkBox.size_allocate()
fixed box layout