by Lawrence R. Rogers (2015-09-30):
* Release 3.11.0-1
Add functions to process an IPset without reading it into memory.
Change definition of skipset_iterator_t.
Change some skIPTree* APIs from macros to functions and vice versa.
Fix a bug in skIPSetIteratorNext() and skIPSetWalk() when visiting the individual IPs of an IPv6 IPset and numeric prefix of the current leaf is 64 or less.
Add support for the SILK_IP_FORMAT environment variable that provides a default value for the --ip-format switch.
Allowing printing of IPset contents without reading the IPset into memory.
Avoid reading an IPset into memory when possible.
Print an error and exit when the --ip-ranges delimiter is set to the comment character('#'), newline, or the empty string.