[oe] Checksums.ini again - new format this time

[Andrea Adami]

And what about having a checksum file in each dir of  /recipes ?
If the checksum changes the PR should be changed too.

While Gentoo's guys started from the opposite situation (one checksum
each recipe), this could be an interesting read:
http://www.gentoo.org/news/20080204-digest-files-removed.xml

Specifically the bits about GLEP44.

My 2 (euro)cents

Andrea