Queue and playlist interactions with lkt

Closes #56 (closed) and #54 (closed)

Adds a way to import a playlist into the queue

doc/lektor.1

@@ -60,11 +60,7 @@ them.
 the \fBarg\fP should be the id of the kara in the sqlite3 database.
 .TP
 \(bu
-\fBfs://${arg}\fP
-the \fBarg\fP should be a part of the path to the kara.
-.TP
-\(bu
-\fBlang://${arg}\fP / \fBlanguage://${arg}\fP
+\fBlang://${arg}\fP
 the \fBarg\fP should be the language of the kara.
 .TP
 \(bu
@@ -72,12 +68,16 @@ the \fBarg\fP should be the language of the kara.
 the \fBarg\fP should be the type of the kara.
 .TP
 \(bu
-\fBcat://${arg}\fP / \fBcategory://${arg}\fP
+\fBcategory://${arg}\fP
 the \fBarg\fP should be the category of the kara.
 .TP
 \(bu
 \fBauthor://${arg}\fP
-the \fBarg\fP should be the author of the kara
+the \fBarg\fP should be the author of the kara.
+.TP
+\(bu
+\fBplaylist://${plt-name}\fP
+The \fBplt-name\fP should be the name of a playlist.
 .TP
 \(bu
 \fBquery://${arg}\fP