Revert latest commits.

This reverts commit f3c66416fbaba3c76429a7d8cf07402d35f6117e.
This reverts commit 56371d52d613e62ccbf7d95673876645c2104efa.
This reverts commit 30642687db489416e2ad060e92306d26e45bb61a.
Select first item in jump-to-song list automatically.  Closes: #108.
Fix audtool copyrights and add to AUTHORS. Remove example files with no copyright notice.
Force playlist update when settings are changed in preferences. Closes: 114.
Add inode/directory to list of MIME types. Closes: #102.
Translation updates.
Fix violation of mutex locking order (playback then playlist). Found by Helgrind.
Use faster g_strlcpy() instead of sprintf().
libaudgui: Use bold font for calculating column width.
Free PangoFontDescription at the end. (see previous commit)
Rewrite URL opener based on GtkDialog.
Styling fix: remove a double border in about window.
Hide treeview headers in jump to song window.
Rewrite jump to time dialog based on GtkDialog (copied from url-opener.c). Minor fixes to url-opener.c.
Replace gpointer with (void *).
Rewrite plugin preferences code using GtkDialog.
Add plugin_do_{about,configure} and fix segfault when configuring an effect that uses PreferencesWidgets from GTKUI.
Make it optional for effect plugins to provide flush().
Show Output Plugin Preferences if available.
Merge branch 'master' of github.com:audacious-media-player/audacious