patch 8.0.0642: writefile() continues after detecting an error

Problem:    writefile() continues after detecting an error.
Solution:   Bail out as soon as an error is detected. (suggestions by Nikolai
            Pavlov, closes vim#1476)

patch 8.0.0641: cannot set a separate highlighting for the quickfix line

Problem:    Cannot set a separate highlighting for the current line in the
            quickfix window.
Solution:   Add QuickFixLine. (anishsane, closes vim#1755)

patch 8.0.0640: mismatch between help and actual message

Problem:    Mismatch between help and actual message for ":syn conceal".
Solution:   Change the message to match the help. (Ken Takata)

patch 8.0.0639: the cursor position is set when editing a new commit …

…message

Problem:    The cursor position is set to the last position in a new commit
            message.
Solution:   Don't set the position if the filetype matches "commit".
            (Christian Brabandt)

patch 8.0.0638: cannot build with new MSVC version

Problem:    Cannot build with new MSVC version VS2017.
Solution:   Change the compiler arguments. (Leonardo Manera, closes vim#1731,
            closes vim#1747)

patch 8.0.0637: crash when using some version of GTK 3

Problem:    Crash when using some version of GTK 3.
Solution:   Add #ifdefs around incrementing the menu index. (Kazunobu
            Kuriyama)

patch 8.0.0636: when reading the undo file fails may use uninitialize…

…d data

Problem:    When reading the undo file fails may use uninitialized data.
Solution:   Always clear the buffer on failure.

patch 8.0.0635: when 'ignorecase' is set script detection is inaccurate

Problem:    When 'ignorecase' is set script detection is inaccurate.
Solution:   Enforce matching case for text. (closes vim#1753)

patch 8.0.0634: cannot easily get to the last quickfix list

Problem:    Cannot easily get to the last quickfix list.
Solution:   Add "$" as a value for the "nr" argument of getqflist() and
            setqflist(). (Yegappan Lakshmanan)

patch 8.0.0633: the client-server test is still a bit flaky

Problem:    The client-server test is still a bit flaky.
Solution:   Wait a bit for the GUI to start.  Check that the version number
            can be obtained.