Merge pull request #415 from chrox/master

fix font size change when reopening the same credocument
pull latest koreader-base with 16bpp blitbuffer fixes
Merge pull request #416 from chrox/master

add Kindle-like dictionary window follow-up
Merge pull request #417 from hwhw/master

pull latest koreader-base with 16bpp blitbuffer fixes
remove redundant debug
show both reader menu and config menu when tapping top
So the bottom tap zone is optional now and will be removed by default
in the future.