updated for version 7.4a.040
Problem:    Win32: using uninitialized variable.
Solution:   (Yukihiro Nakadaira)
Added tag v7-4a-040 for changeset 1261caf9bc51
updated for version 7.4a.041
Problem:    When using ":new ++ff=unix" and "dos" is first in 'fileformats'
	    then 'ff' is set to "dos" instead of "unix". (Ingo Karkat)
Solution:   Create set_file_options() and invoke it from do_ecmd().
Added tag v7-4a-041 for changeset 74d2f3188cd0
updated for version 7.4a.042
Problem:    Crash when BufUnload autocommands close all buffers. (Andrew
	    Pimlott)
Solution:   Set curwin->w_buffer to curbuf to avoid NULL.
Added tag v7-4a-042 for changeset 1899acc5aebd
updated for version 7.4a.043
Problem:    More ml_get errors when adding or deleting lines from Python.
	    (Vlad Irnov)
Solution:   Switch to a window with the buffer when possible.
Added tag v7-4a-043 for changeset 6fa64615c8d3
updated for version 7.4a.044
Problem:    Test 96 sometimes fails.
Solution:   Clear window from b_wininfo in win_free().  (Suggestion by
	    Yukihiro Nakadaira)
Added tag v7-4a-044 for changeset 647596ab1ae2