qt: Backup former GUI settings on `-resetguisettings`

Pull Request #11338

State completed
Build time Total: 42 minutes
7 minutes for macOS
14 minutes for Windows
21 minutes for Linux
Platforms   
Start Date2017-09-18 22:15:06 UTC
Github#11338
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Author laanwj
Pull request head hashb28af386
Build styleThis pull request was built on top of current master
Build Log HEAD~67e539b72d Merge branch '2017_10_backup_resetguisettings' of https://github.com/laanwj/bitcoin
4ce2f3d0d Merge #11323: mininode: add an optimistic write and disable nagle
44e1fd926 Merge #11345: [tests] Check connectivity before sending in assumevalid.py
d6d2c8503 Merge #11340: Trivial: Fix validation comments
b28af386a squashme: code style, doc
0f29983c8 squashme: guisettings.ini.bak