Transcode: We want to be strict when calling module_Need for audio filter, video filters and the deinterlace video filter too. (This fixes a problem with deinterlace not loading on my computer)

The attached patch adds 2 config options for JACK output: a boolean
saying whether or not to connect automatically, and an optional
prefix which filters out input ports so VLC connects only to the
port(s) you want.

Patch from Paul Corke <paul.corke at datatote dot co do uk). It enables newer ivtv drivers to be used with the pvr input. Plus some additions and fixes from me:code cleanups, fix memoryleaks, coding style and identation fixes.

                      image before sending it to the mosaic.
                    - Add option ("chroma") to force the image chroma
                    - Remove alpha mask code
 * mosaic.c: - Remove bluescreen code
             - Misc cosmetics changes
 * bluescreen.c: New bluescreen filter (mostly cut & paste from mosaic.c)
 * alphamask.c: New alpha mask filter (mostly cut & paste from mosaic_bridge.c)
 * invert.c: don't invert the alpha plane for YUVA images (We also need to
             prevent that for RGBA images ... but that's not really used
             currently)
 * configure.ac, video_filter/Modules.am: add alphamask and bluescreen

 * Add missing space in help string.

 - Remove GNU/makeisms
 - Cleanup

 - Make the desktop icon execute vlc instead of wxvlc

(which is always)

This is not strictly required, but helps propage fix for #1086.

 - Remove net_ListenSingle from LibVLC API
 - Improve error message when network protocol to be used is ambiguous