use less memory as element->span[0] will always be 1; any level 0 skip list is essentially a linked list

Better to increment the version minor number when a VM bug is fixed... it will be simpler to understand what's going on when users will report problems with the INFO trace.

A problem with replication with multiple slaves connectiong to a single master fixed. It was due to a typo, and reported on github by the user micmac. Also the copyright year fixed from many files.