Problem:    Using one window for executing autocommands is insufficient.
Solution:   Use up to five windows for executing autocommands.

Problem:    Various typos.
Solution:   Correct typos. (closes #11432)

Problem:    If 'endofline' is set the CTRL-Z may be written in the wrong
            place.
Solution:   Write CTRL-Z at the end of the file.  Update the help to explain
            the possibilities better. (Ken Takata, closes #11486)

Problem:    Confusing error for "saveas" command with "nofile" buffer.
Solution:   Give a clearer error message. (closes #11171)

Problem:    The +wildignore feature is nearly always available.
Solution:   Graduate +wildignore for consistency.

Problem:    Too many #ifdefs.
Solution:   Make some functions always available.

Problem:    Tiny chance that creating a backup file fails.
Solution:   Check for EEXIST error. (Ken Takata, closes #10821)

Problem:    Various white space and cosmetic mistakes.
Solution:   Change spaces to tabs, improve comments.