v0.14.44-rc.2

This is a release candidate for v0.14.44.

Bugfixes since v0.14.44-rc.1:

 - #4676: Panic: fatal error: unexpected signal during runtime execution

Bugfixes:

 - #4634: Panic when connecting to device with auto accept and paused folders
 - #4636: List of files needed on remote is not wrapped at word boundaries
 - #4644: Impossible to run non-release builds without deadlock detectors
 - #4649: UTF-8 normalization does not work correctly on ZFS.
 - #4654: Upgrade system shows an error on RCs in some cases
 - #4657: Sparse files with zero blocks are not closed when pulling
 - #4668: Remote device out of sync items shows "0 items, ~0 B"

Enhancements:

 - #2599: GUI for .stversion restoration
 - #4499: Log entries showing IP addresses should show connection type
 - #4628: Set background priority / niceness

Other issues:

 - #4567: Arguments to fs.CreateSymlink are mixed up
 - #4618: More scalable global discovery
 - #4653: lib/model test fails with "ThreadSanitizer failed to allocate 0x200000 (2097152) bytes" with Go 1.9.2
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