It was enabled by default, but it's mostly only needed for CJK users.
Furthermore, when floating punctuation is enabled, some rendering
issues exist (text right alignment, variable margins...) that
only CJK developpers could really fix. So, best to disable it and
avoid these rendering issues for most users.
Also: fix CoverBrowser crash when "Delete cache database"
followed by "Prune cache of removed books".
Fix various inconsitencies: some occurences not highlighted
on displayed page; different occurences highlighted on same
page wheter we went there searching backward or forward; pages
with occurences simply just skipped when searching in one
direction, and not in the other...
To avoid edge cases, crengine will now give back results on up
to 3 pages, that we need to filter.
Bump base and crengine
