FLV VP6 height/width refinement

Merging changes contributed by Xander Schouwerwou:

"I enlarged my test set and found a few issues. One of them is mixing up
the width and height in GETID3_FLV_VIDEO_VP6FLV_ALPHA. So I improved the
GETID3_FLV_VIDEO_VP6FLV_ALPHA, and only applying the width & height if
the meta data isn't set. The metadata is used by most applications.

In audioFormatLookup I added 'Speex' Source:
http://download.macromedia.com/f4v/video_file_format_spec_v10_1.pdf

For h264 readData() in AVCSequenceParameterSetReader should only be used
when the profile > 0.
Todo: not tested with profile 66
Also, if frame_mbs_only_flag is set, mb_adaptive_frame_field_flag should
be ignored."