Issue #2169449: Removed the old temp file step in _s3fs_image_style_deliver().

This was a remnant of a performance improvement which I write in an attempt to
speed up image style creation. It didn't work, and I forgot to remove the change.
Fortunately, switching to the new SDK *did* work.
Issue #2178817: Copied the code from _s3fs_schema() into s3fs_schema().

Apparently the code from s3fs.module is not available during the uninstall phase,
so I had to copy the schema definition code back into the .install file.
admin page will now correctly handle instance profile related settings.