* fix for NB#63391, where a notes-attachment would be opened in the browser instead

* fix for NB#63391, where a notes-attachment would be opened in the browser instead
  - code would make a temp file <random>.ext and ask the mime system to open that,
  however, it only took the *last* extension, so foo.notes.html would become
  <random>.html, and thus opened in browser
  - second, it would open with these funny random chars in the name
  - solution: we now make a temporary-directory (with random name), and save the
  attachment file there with it's real name
  - one issue remaining are attachments without a name.

* make #define hildon_foo --> osso_foo for the functions in modest-platform, so we can
  get rid of the ugly #ifdef blocks.

pmo-trunk-r3179