update wunderground addon
Revert "[rbp] Always use the aspect ratio from file."

This reverts commit 7f5d3ede514f30552e42464c29227d570b38ed8a.
[rbp/omxplayer] Use aspect ratio from video decoder

We don't get a valid aspect ratio from tvheadend with mpeg2 files, but the decoder does know, so use that.
This also supports streams where aspect ratio changes (e.g. at commercials) (with firmware from 25 June or newer).
[rbp/omxplayer] Check total memory, and if plenty use full size buffers

omxplayer has used a quarter sized video buffer and a half sized audio buffer for the file reading message queue, compared to dvdplayer.
This is required on 256M boards, but is unneccessary on 512M board. So we query the memory size and use full size buffers if possible.
[rbp/omxplayer] Use timestamps given to gpu as GetCurrentPts

Currently the timestamps gpu is using and those returned from GetCurrentPts can diverge, making decisions inaccurate.
Make sure they use the same timestamps by bringing the timestamp code up from OMXVideo to OMXPlayerVideo.
[rbp/omxplayer] More care with marking GetCurrentPts as invalid
Merge pull request #2892 from ronie/weather-fixes

update wunderground addon
Merge pull request #2919 from popcornmix/aspect_from_decoder

[rbp/omxplayer] Use aspect ratio from video decoder
Merge pull request #2918 from popcornmix/big_buffer

[rbp/omxplayer] Check total memory, and if plenty use full size buffers
Merge pull request #2925 from popcornmix/gpu_timestamps

[rbp/omxplayer] Use timestamps given to gpu as GetCurrentPts