Modify xorg.conf_intel to work on Ubuntu 14.04-LTS / XOrg 1.15.

The Option DRI "2" disables DRI3 on DRI3/Present capable intel
ddx'es, but causes complete server startup failure on DRI2 only
intel-ddx'es, e.g., the ones shipping in Ubuntu 14.04-LTS.

Yes, the inconsisteny madness of the intel ddx never fails to
entertain...
Use a new splash screen which begs for donations.

Logo GIMP image file and ppm added to managementtools/
as DonationSplash.[xcf/ppm]. WelcomeSplash.ppm updated.

License.txt contains attribution to gratipay.com and
explanation why we can use their logo in our splash
screen.

-> First v3.0.12 release "Random acts of kindness"
   is ready for release.

(cherry picked from commit 4e180a434f0cc08f4982952b825bd724e5ee7acc)