Tweaks for release.
Start 1.3.39.
Make the server request the whole file when ctime changes on Windows,
otherwise changes to metadata when the file content is unchanged will not
be noticed.
Merge branch '1.3-master'

Conflicts:
	CHANGELOG
	src/version.h
Remove debug.
Merge branch '1.3-master'
Add 'delete' to the client help output.
Merge branch '1.3-master'