+ v2.0.38 tweaks for perl wrappers
+ reference-counting seems working using ddc 2.0.38
+ better reference-counting attempts
+ tagged ddc-perl-0.16
+ tagged ddc-perl-0.15
+ more text format fixes for deep-encoded json context tokens / ddc-2.0.38
+ text format fixes for deep-encoded json context tokens / ddc-2.0.38!
+ better fixes for deep json context tokens in ddc-2.0.38
+ fixes for deep json context tokens in ddc-2.0.38
+ updated docs