cinstall contribution

[DJ Delorie]

Applied.  Thanks!  I did make some minor changes, though...

I changed my mind about site.h.  That function isn't really a public
API, so instead of adding site.h I just added a prototype in other.cc.

I added a few spaces before parens to meet GNU coding styles (yes,
I have to now go fix all of *my* similar mistakes).

I did add the concat fix.

I changed save_URL() to save_site_url().

I scan for both \r and \n when reading the saved url.

Keep up the good work!

DJ