addurl, importfeed: Changed to honor annex.largefiles settings, when the content of the url is downloaded. (Not when using --fast or --relaxed.)

importfeed just calls addurl functions, so inherits this from it.

Note that addurl still generates a temp file, and uses that key to download
the file. It just adds it to the work tree at the end when the file is small.

doc/todo/make_addurl_respect_annex.largefiles_option.mdwn

@@ -2,3 +2,5 @@ ATM git annex addurl ignores  annex.largefiles option so to automate annexificat
 
 N.B. I do understand that use-case might be somewhat vague, let me know if I should expand reasoning
 [[!meta author=yoh]]
+
+> [[done]] --[[Joey]]