Log Message:
Update mew to 5.2.

Changes from 5.1 to 5.2: (http://www.mew.org/release/index.html.en#Mew-5.2)

* Full S/MIME support based on GnuPG 2.
        http://www.mew.org/feature/smime.html.en

* Automatic resizing for large JPEG/PNG images.

* Hyper Estraier support.
        http://www.mew.org/feature/est.html.en

Hyper Estraier is a full text search engine based on the N-gram
algorithm which is independent on language. You can search your target
messages from ALL folders on Windows, Mac, and UNIX.