time-to-seconds is obsolete.
Unused variable
_ indicates a variable is ignored.
user-error is "not known to be defined" in emacs 24.2
sx-display-question is not known to be defined.

It was the wrong function to use anyway.
split-string used to take only 3 args
`sx-custom-button' fails to specify containing group
Merge pull request #158 from vermiculus/fix-some-warnings

Fix some warnings