docs: Updated license and copyright using verbiage from LBNL's IPO
docs: updating copyright dates and minor fixes
Updated end date (why is this even necessary?)
Preparation for 5.2 release
Reduced occurrence of aiming failures for circular sources (Thanks to David G-M)
Changes and check-in for 3.5 release Includes new source files and modifications not recorded for many years See ray/doc/notes/ReleaseNotes for notes between 3.1 and 3.5 release
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