http_renderer: back to using only one type of burst size (1400 bytes).
http_source: now pausing curl when the cache size is twice the initial size (TODO: cache sizes and stuff will be made configurable).
mp3_metadata: fixed mpg123_param call so that the LAME/Xing info frames are left in and the id3v2 tags are out.
tplay: reverted the http server graph to using the mp3 metadata eraser component.