Merge pull request #345 from chrox/master

highlight text from scratch instead of reusing rectmaps in reflowing mode
Merge pull request #346 from chrox/master

smoother relative panning in scrolled pages
Merge pull request #347 from chrox/master

various fixes and features in koreader-base
updated koreader-base reference, was broken
Merge pull request #348 from hwhw/master

updated koreader-base reference, was broken
update koreader-base (fix OCR init failure)