Problem:    A quick undo shows "1 seconds ago". (Tony Mechelynck)
Solution:   Add singular/plural message.

Problem:    Redundant condition for boundary check.
Solution:   Remove the condition. (Dominique Pelle). Change FALSE to FAIL.

Problem:    Using dict_add_nr_str() is clumsy.
Solution:   Split into two functions. (Ozaki Kiichi, closes #3154)

Problem:    Undo message delays screen update for CTRL-O u.
Solution:   Add smsg_attr_keep(). (closes #3125)

Problem:    MS-Windows: Cannot interrupt gdb when program is running.
Solution:   Add debugbreak() and use it in the terminal debugger.
            Respect 'modified' in a prompt buffer.

Problem:    No compiler warning for wrong format in vim_snprintf().
Solution:   Add printf attribute for gcc.  Fix reported problems.

Problem:    Too many #ifdefs.
Solution:   Graduate the +autocmd feature. Takes away 450 #ifdefs and
            increases code size of tiny Vim by only 40 Kbyte.

Problem:    Clearing a pointer takes two lines.
Solution:   Add VIM_CLEAR() and replace vim_clear(). (Hirohito Higashi,
            closes #2629)

Problem:    Compiler complains about uninitialized variable. (Tony Mechelynck)
Solution:   Assign a value to the variable.

Problem:    Using ":undo 0" leaves undo in wrong state.
Solution:   Instead of searching for state 1 and go above, just use the start.
            (Ozaki Kiichi, closes #2595)