Show feed name in item view when in merged views.

When viewing "merged" nodes such as "Unread", search folders or
regular folders, display feed name (with link) so that you know where
the item is coming from.

Signed-off-by: Lars Windolf <lars.lindner@gmail.com>
Changelog for SF patch #233
Merged SF #219: View *.xml files along with *.opml files in file chooser
 (patch by Simon Kågedal Reimer)
ttrss_source_auto_update(): remove a no longer used variable
Merge branch 'master' of git://git.code.sf.net/p/liferea/code
ChangeLog: Removed trailing whitespace
Require intltool >= 0.40.4

This allows us to get rid of po/ChangeLog
.gitignore: Add po/liferea.pot
Makefile.am: Add a rule for po/liferea.pot

This makes "make dist" happy.
configure.ac: Remove the unused AC_PROG_INSTALL
Merge branch 'master' of git://git.code.sf.net/p/liferea/code
Added RDF MIME type.
Merge branch 'master' of ssh://git.code.sf.net/p/liferea/code
Merge branch 'master' of git://git.code.sf.net/p/liferea/code
ttrss source: Fix update bug when removing multiple feeds

Previously, when several feeds were removed in Tiny Tiny RSS, only one
would get removed from Liferea for every update.  This happens because
we're removing items from the same list we're iterating, which causes
confusion.  This fixes it by collecting nodes to remove and postponing
the actual removing until after the iteration.
Merge branch 'fix_ttrss_remove'