Queue and playlist interactions with lkt

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

Adds a way to import a playlist into the queue

doc/lkt.1

@@ -108,6 +108,9 @@ Clear the queue and set the state to \fIstopped\fP
 \fBqueue crop\fP
 Crop the queue, delete every kara from it appart from the currently
 playing one
+.TP
+\fBqueue replace\fP <plt-name>
+Replace the queue with the content of a playlist. Keep the playling state
 .PP
 
 \fISEARCH-COMMANDS\fP
@@ -214,7 +217,7 @@ In SQL regexes, the wildcard is the "%" character and the jocker the
 character "_". Queries are case insensitive.
 .PP
 Valid types for a query are the following: \fIid\fP, \fIlang\fP, \fItype\fP,
-\fIcategory\fP, \fIauthor\fP, \fIquery\fP.
+\fIcategory\fP, \fIauthor\fP, \fIquery\fP and \fIplaylist\fP.
 .PP
 For the type \fItype\fP, the valid values are the following: \fIOP\fP,
 \fIED\fP, \fIIS\fP, \fIAMV\fP, \fIVOCA\fP, \fIMV\fP, \fIPV\fP