Preparation for new function "browse"
Reuse previous search
Reaarange cancel buttons to the left
Merge pull request #811 from WS64/master

Reuser earlie search and minor bugfixes
close screen framebuffer when exiting reader
ImageWidget now supports png, jpg and tiff files
revert rebasing with sourceforge upstream
fix #799
fix #801
add follow links option in navigation tab of reader menu
If "Follow links" options is not checked links won't be followed.
The "Follow links" option is checked by default.
This option affect both PDF and EPUB documents.
lift TOC entry in navi tab
config line space/font gamma values directly
update pot file
use pdfreader instead of crereader to handle zip files
Generally zip files are zipped pictures which should be
better handled in pdfreader.
update mupdf and k2pdfopt to latest versions