tools: pmempool utility

- pmempool utility with the following commands:
-- create - creating pool files
-- info - parsing pool files
-- dump - dumping data from pool files
-- check - checking and repairing pool files
- update scripts for creating packages
- bash completion script
- manual pages and README file
Yes you are right. The nextoff is zero for the last arena and here I'm iteration through all arenas, so this loop should end after nextoff is zero. I will add explicit > 0 comparison.