* Wiki Save as EPUB: various encoding fixes
Fix display of & in article titles
Fix display of &, <, > in TOC entries and in targeted anchor (the mismatch
with the target id made these TOC entries invalid and simply not displayed).
Remove percent-encoded URLs tweaks for crengine now that crengine
correctly supports them (each percent encode handled as an UTF8 byte).
Bump crengine for that.
Don't include <meta name="cover"> when no cover present.
* bump base/crengine