page links for crereader and pdfreader
Swipe right will return to previous page or position.
fix no getPageLinks method in djvudocument
tweaks on dimension of dictionary window
fix dogear not shown properly in crereader
adjust nice value of reader.lua process to -2
when launching koreader with KUAL
This should fix #413.
Merge pull request #463 from chrox/master

page links for crereader and pdfreader