Log Message:
Update to 0.20:

0.20 (2011/01/03)
* require libmpdclient 2.2
* reactivate "search filename"
* MixRamp support
* support --format with "ls" and "listall"
* new command "clearerror"
* implement "current --wait"
* command "add": print the failed song

0.19 (2009/12/06)
* search: fix "mpc search any"
* idle: flush output after each idleloop iteration
* added command "sticker" (MPD 0.15)
* added command "replaygain" (MPD 0.16)
* implemented %position%, %id% for --format
* fixed bash completion

0.18 (2009/10/05)
* don't quote spaces in the "load" and "lstab"
* revert "disable character set conversion to/from pipe"
* don't use the deprecated "volume" command
* added option "update --wait"
* allow options before and after the command
* treat negative numbers as non-options
* using libmpdclient 2.0 instead of built-in libmpdclient
* don't print song numbers in the "playlist" command
* idle: added "mask" parameter
* added the "findadd" command

0.17 (2009/08/13)
* fixed busy loop while waiting for "idle" response
* added command "idleloop"