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
General code comment: There are a lot of different ways you are handling errors. I am actually not sure what are the differences. Perhaps a defined error handling scheme would be useful.