patch 8.0.0691: compiler warning without the linebreak feature

Problem:    Compiler warning without the linebreak feature.
Solution:   Add #ifdef. (John Marriott)

patch 8.0.0690: compiler warning on non-Unix system

Problem:    Compiler warning on non-Unix system.
Solution:   Add #ifdef. (John Marriott)

patch 8.0.0689: ~ character not escaped when extending search pattern

Problem:    The ~ character is not escaped when adding to the search pattern
            with CTRL-L. (Ramel Eshed)
Solution:   Escape the character. (Christian Brabandt)

patch 8.0.0688: cannot resize the window in a FileType autocommand

Problem:    Cannot resize the window in a FileType autocommand. (Ingo Karkat)
Solution:   Add the CMDWIN flag to :resize. (test by Ingo Karkat,
            closes vim#1804)

patch 8.0.0687: minor issues related to quickfix

Problem:    Minor issues related to quickfix.
Solution:   Set the proper return status for all cases in setqflist() and at
            test cases for this.  Move the "adding" flag outside of
            FEAT_WINDOWS. Minor update to the setqflist() help text. (Yegappan
            Lakshmanan)

patch 8.0.0686: extra redraw when using CTRL-L in second window

Problem:    When typing CTRL-L in a window that's not the first one, another
            redraw will happen later. (Christian Brabandt)
Solution:   Reset must_redraw after calling screenclear().

patch 8.0.0685: when conversion fails written file may be truncated

Problem:    When making backups is disabled and conversion with iconv fails
            the written file is truncated. (Luo Chen)
Solution:   First try converting the file and write the file only when it did
            not fail. (partly by Christian Brabandt)

patch 8.0.0684: old style tests are not nice

Problem:    Old style tests are not nice.
Solution:   Turn two tests into new style. (pschuh, closes vim#1797)

patch 8.0.0683: visual bell flashes too quickly

Problem:    When using a visual bell there is no delay, causing the flash to
            be very short, possibly unnoticeable.  Also, the flash and the
            beep can lockup the UI when repeated often.
Solution:   Do the delay in Vim or flush the output before the delay. Limit the
            bell to once per half a second. (Ozaki Kiichi, closes vim#1789)

patch 8.0.0682: no test for synIDtrans()

Problem:    No test for synIDtrans().
Solution:   Add a test. (Dominique Pelle, closes vim#1796)