Problem:    Compiler warnings in Perl code when building with Visual studio
            2012. (skeept)
Solution:   Add type casts. (Christian Brabandt, 2013 Jan 30)

Problem:    Lua version 5.2 is not detected properly on Arch Linux.
Solution:   Adjust autoconf. (lilydjwg)

Problem:    Compiler warning for tiny build. (Tony Mechelynck)
Solution:   Add #ifdefs around variable.

Problem:    Substitute with confirmation and then "q" does not replace
            anything.  (John McGowan)
Solution:   Do not break the loop, skip to the end.

Problem:    After setting 'isk' to a value ending in a comma appending to the
            option fails.
Solution:   Disallow a trailing comma for 'isk' and similar options.

Problem:    ":window set nu?" displays the cursor line. (Nazri Ramliy)
Solution:   Do not update the cursor line when conceallevel is zero or the
            screen has scrolled. (partly by Christian Brabandt)

Problem:    The " mark is not adjusted when inserting lines. (Roland Eggner)
Solution:   Adjust the line number. (Christian Brabandt)

Problem:    The color column is not correct when entering a buffer. (Ben
            Fritz)
Solution:   Call check_colorcolumn() if 'textwidth' changed. (Christian
            Brabandt)

Problem:    MzScheme: circular list does not work correctly.
Solution:   Separate Mac-specific code from generic code. (Sergey Khorev)