Fix #1363948 [Empty areas in window Create catalog dialog](https://bugs.launchpad.net/calibre/+bug/1363948)
Small performance improvement
DOCX Input: Fix non-breaking hyphens being ignored
Ensure splash screen is hidden if there is an error during startup, so that the error message does not appear behind the splash screen thanks to regressions in Qt 5
Workaround for Qt 5 behavior change on OS X which prevented error handling during startup on OS X to not work
Fix #1363990 [Create catalog dialog - save presets](https://bugs.launchpad.net/calibre/+bug/1363990)
Conversion: Fix incorrect conversion of CSS when the input document uses the same CSS class name in both upper and lower case. Fixes #1328552 [Private bug](https://bugs.launchpad.net/calibre/+bug/1328552)
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Update Common Dreams