Rename ctime to asctime and add *proper* ctime.

In C, `ctime(t)` is equivalent to `asctime(localtime(t))`, so the result
should depend on the local timezone. Current `ctime` is compatible with
`asctime` in C, not `ctime`.

This commit renames `ctime` to `asctime` and adds `ctime` which converts
the time to the local timezone before formatting it.

This commit also fixes the documentation of them. Current documentation
of `ctime` says it returns "a string of the current time." However, it
actually returns a string of the time represented as `self`, not the
time when it is called.

Signed-off-by: OGINO Masanori <masanori.ogino@gmail.com>

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