bump version
use method rather than direct hash access; ptidy
fix object type passed to Utils method
better error checking
ptidy; better error checking and coercion on delegates
Aggregator does not require an indexer so check first if defined
add DeziVersion to swish.xml Index header
fix docs
pmvers util requires VERSION on its own line
check for blessed before calling isa
make classes immutable (big run-time speed up, 3-5x)
note immutable