Updating copyright headers in the models/ directory.
Moved the (shutdown-agents)(flush) code from clj-span.commandline to clj-span.core.
Major overhaul of the line-of-sight model! Go Ioannis Go!
Added diagonal distance function
Merge branch 'master' of https://github.com/lambdatronic/clj-span

Conflicts:
	src/clj_misc/utils.clj