Updating license information and removing package.html.

As requested by Arnaud I have updated the license to Apache v2 and removed the old package.html files.

In some cases I could not automatically determine the year for the copyright, so this still needs to be done (and should be done quickly after this change or as part of it).

Arnaud: I noticed a few more places I can extract a date (my script didn't spot "07" as a year for example) but other than that I've done all I can.