[vdr] livebuffer patch improvements suggestions.

Hello.

1) RAM is cheap now days. Can I use RAM to keep buffer data? (System running from USB stick so only reason to start Hard Disk is when i use recordings)

2) Patch only record current channel. It would be nice if i can select channels from lists where buffers are active. Example. i change channel and noticing that program what i want to look is already running so i simply press "jump backward" button and start to look program from beginning. (2GB can keep about 100 minutes in buffers. If i select 5 different channels that i got 20mins buffer in every channel)

Regards: Tommi