Problem:    Warnings reported by MSVC.
Solution:   Rename variables and other fixes. (Ken Takata, closes #9689)

Problem:    Using int for second argument of ga_init2().
Solution:   Remove unnessary type cast (int) when using sizeof().

Problem:    Error messages are spread out.
Solution:   Move more errors to errors.h.

Problem:    Error messages are spread out.
Solution:   Move more errors to errors.h.

Problem:    Error messages are everywhere.
Solution:   Move more error messages to errors.h and adjust the names.

Problem:    getcompletion() always passes zero as position to custom
            completion function.
Solution:   Pass the pattern length. (closes #9173)

Problem:    completion() does not work properly.
Solution:   Set xp_line and add WILD_HOME_REPLACE. (Shougo Matsushita,
            closes #9016)

Problem:    ":buf \{a}" fails while ":edit \{a}" works.
Solution:   Unescape "\{". (closes #8917)

Problem:    Completion for :disas sorts local functions first.
Solution:   Sort local functions last, like with :delfunc. (Naohiro Ono,
            closes #8860)

Problem:    augroup completion escapes regexp pattern characters.
Solution:   Do not escape the augroup name. (closes #8826)