update koreader-base
refactoring koptcontext creation function
add DHINTCOUNT in defaults.lua
It controls how many number of pages will be hinted in background
after one page has been drawn. Default DHINTCOUNT is 2.
set default render quality in reflowing to 1.0
which should be a good tradeoff between speed and quality.
split text string with even finer granularity
add DSHOWOVERLAP in defaults.lua
Turn off "show overlap" by default since scroll mode can replace it
in most cases where "show overlap" is used. And the dimmed area often
make new users confused. It's better to leave this feature to more
advanced users.
fix wrong indentation
Merge pull request #273 from chrox/master

add DHINTCOUNT in defaults.lua