core:
 * Fix case unsensitive search for Deseret and Osage. Issue #853
 * Fix crash in unicodeToAscii7
 * CairoOutputDev: make initialisation thread-safe
 * Fix crash on broken files. Issues #869, #870
 * Internal code improvements

qt5:
 * Fix FormField::name encoding
 * Accept UTF-16 uiNames for form fields
 * Fix search for "complex" characters
 * Allow to load document from QIODevice

utils:
 * pdftoppm/pdftocairo: Fix -e/-o printing the wrong pages. Issue #873
 * pdftohtml: Fix issue with the font size sometimes being huge

glib:
 * make the frontend initialization thread safe.