metapop ctor craziness
digital_evolution updated to ltr/env idiom, copy ctor and assignment fixed; metapop next
updated metapopulation for ltr/env, starting ps
applied ltr/env to ea, ealib tests pass
updated archive, checkpoint; all tests and examples pass for rai refactoring
ignore checkpoints
bugfix: subpop founder returning copy of shared_ptr object, instead of ref
merged with rai
last of delta graph changes