Add dir entry to mime-ui-{en,ja}.texi

[egh]

This will allow install-info to work, which will enable proper installation of the documentation via MELPA.

You can test as follows:

makeinfo *.texi 
install-info --dir=dir mime-ui-en.info 
install-info --dir=dir mime-ui-ja.info 
cp dir ~/.emacs.d/elpa/semi-20160701.440/dir # or wherever you have semi installed as a package

[ikazuhiro]

+* SEMI (en): (mime-ui-en). MIME user interface (used by Wanderlust)

There may be no maintained project other than Wanderlust, but FLIM and SEMI are not special to Wanderlust. For example, cmail (Japanese) and Lookup 1.4+media (Japanese) use APEL / FLIM / SEMI. Or, do you want to distinguish from original FLIM, SEMI?

[egh]

The intention was to indicate to wanderlust users that if they want documentation about how to view messages, they should look in the SEMI documentation. But I am happy to remove it, since there is a cross reference from the Wanderlust documentation.

[ikazuhiro]

Merged, thank you.

[egh]

Thanks!