Revert needed, since otherwise there is no way to do automatic sorting
of includes.
Also reverted change to the docs, as leaving it would make incorrect
docs.
In case of conflicts, includes were sorted according to the coding
standards from #3839.
This reverts commit b4a9f04f92.
This reverts commit 5921122960.
Fixed#3660. Removed using of GUI class in Profile Importer. Because, it
cannot be used before Nexus instance will be created. As result, it
provide crash in some cases.
Importing a profile, saving a QR code image or setting an auto-accept directory using Nautilus as the default file manager, which many users use, was causing a hang in Qt's method. Setting Qt to use it's own file manager in this circumstance fixes the issue. Closes#3436, closes#3443.
