Move ui into ui subdirectory
Extract ui/cancellation unit

Managing operation cancellation.
Extract ui/statusbar unit

Managing status bar.
Extract ui/statusline unit

Formatting status line.
Merge branch 'break-ui-unit-into-subunits'

Break ui.c into:

 - cancellation.c - managing operation cancellation
 - statusbar.c - managing status bar
 - statusline.c - status line formatting
 - ui.c - ui initialization and other ui related functions
Fix current file number in progress message

On moving files across file systems when 'syscalls' is on.

Thanks to filterfalse.
Merge branch 'fix-syscalls-move-progress'

Fix current file number in progress message

On moving files across file systems when 'syscalls' is on.

Thanks to filterfalse.
Remove unnecessary paragraph in NEWS
Fix gd tag in documentation

Also document default value of the option.
Merge branch 'fix-editorial-mistakes'

* Fix gd tag in documentation.
* Remove unnecessary paragraph in NEWS.