Improve handle of bookcreator requests and some minor fixes
Now bookcreater doesn't allow empty title and selection anymore
Fix some missing globals or redundant
Fix for bookcreator: Catch title before cache, otherwise the downloaded page got nonsens filename.
NOT FIXED: cached pdf don't depends on given title from Bookcreator. So when it changed, the cache has still the old one.
suppress warnings of opendir like 'no such file/dir'
perform the  replacements of the citation per rendered page.
Merge pull request #56 from Klap-in/minorfixesaction

Improve handling of bookcreator requests and some minor fixes