(nice reinvention of the while() loop, but I prefer while())

  so that one day we may be able to use IGMPv3/MLDv2 with VLC streams,
* Add recvonly attribute
* Really fix ordering (c= then t= then a=)
* Put type attribute as a session attribute (as per RFC4566)

for nicer Win32 error messages

(not compile tested, but since no one else wanted to do such a boring commit,
 you can't complain)

    + Remove SDP file when bailing out. Patch by Fabrice Ollivier.

* Reset access->info.b_eof when we search. After you have read up untill the end, (like ps does), you can search back to the beginning, provided the access module allows this.

This would be needed if libvlc is ever embedded in an application that
also uses GnuTLS.

- Some cleanup