Revision control
++ Qt 5.9 introduces many new features and improvements as well as bugfixes
++ over the 5.8.x series. For more details, refer to the online documentation
++ included in this distribution. The documentation is also available online:
++
++
++ The Qt version 5.9 series is binary compatible with the 5.8.x series.
++ Applications compiled for 5.8 will continue to run with 5.9.
++
++ Some of the changes listed in this file include issue tracking numbers
++ corresponding to tasks in the Qt Bug Tracker:
++
++
++ Each of these identifiers can be entered in the bug tracker to obtain more
++ information about a particular change.
++
++ Linguist
++ --------
++
++ - [QTBUG-16368] Added capability of checking that the whitespace
++ surrounding the translations' text matches that of the source strings.
++
++ Assistant
++ ---------
++
++ - Removed the clucene dependency, used FTS5 from sqlite instead.
++ - Search results show now the doc excerpt instead of the explicit link.
++ - Made search results more reliable (e.g.: charset, "UTF-8").
++
++ QtHelp
++ -----------
++
++ - Moved the linksForKeyword() method from QHelpIndexModel into QHelpEngineCore.