Problem:    More compiler warnings. (John Marriott)
Solution:   Add type casts, remove unused variable.

Problem:    When there is any error Vim will use a non-zero exit code.
Solution:   When using ":silent!" do not set the exit code. (Yasuhiro
            Matsumoto)

Problem:    Compiler warnings in build with -O2.
Solution:   Add inintializations.

Problem:    A few more compiler warnings. (Axel Bender)
Solution:   Add type casts.

Problem:    Can't compile Win32 GUI with tiny features.
Solution:   Add #ifdef. (Christian Brabandt)

Problem:    Can't compile with +job but without +channel. (Andrei Olsen)
Solution:   Move get_job_options up and adjust #ifdef.

Problem:    On Mac OS/X the waittime must be > 0 for connect to work.
Solution:   Use select() in a different way. (partly by Kazunobu Kuriyama)
            Always use a waittime of 1 or more.

Problem:    It's difficult to add more arguments to ch_sendraw() and
            ch_sendexpr().
Solution:   Make the third option a dictionary.

Problem:    Merge left extra #endif behind.
Solution:   Remove the #endif

Problem:    Warnings when building the GUI with MingW. (Cesar Romani)
Solution:   Add type cats. (Yasuhiro Matsumoto)