totem spawn many error alerts about unsupported files

[Alexander Sashnov]

Binary package hint: totem

Steps for reproduce:

1. run totem
2. drag-and-drop folder with non-media files, for example, folder with some .tag.gz files

Totem will display one alert per file with text: "Totem could not play 'file://.....' There is no plugin to handle this movie".

This is not a problem for one, two or three files.

But this is critical for big folder with many of non-multimedia files.

Solution:
  Show all errors in one dialog as a table with two columns:

 Following files was not added to playlist
   |----------------------------------
   | Filename | Error |
   |----------------------------------
   | ....
   | ....
   | ....
                       [OK]

[Sebastien Bacher (seb128)]

Thanks for the bug report. This particular bug has already been reported, but feel free to report any other bugs you find.