functions to new dsdlib. Update user doc.

Search and add search result to a stored playlist.

Conflicts:
	src/cmdline.c
	src/decoder/wildmidi_decoder_plugin.c
	src/gcc.h
	src/glib_compat.h
	src/input_stream.c
	src/output_list.c
	src/output_thread.c
	valgrind.suppressions

Dump all archive plugins, even those that fail to initialise.

Don't require the caller to provide them.

g_file_test is redefined to be g_file_test_utf8 and thus can't handle
non-ASCII characters. This fix adds simple wrapper (taken from glib)
that fixes encoding and calls g_file_test_utf8. All required inclusions
of glib_compat.h are added as well.

False positives in gcc 4.7.