Keep tick formatting when zooming.
Merge pull request #190 from rjuju/fix_zoom

Keep tick formatting when zooming.
Add a new program pgbadger_tools.pl to demonstrate how to deal with pgBadger binary files to build your own new feature. The first one 'explain-slowest' allow printing of top slowest queries as EXPLAIN statements.
Fix case where die with interrupt signal is received when using -e option. Thanks to Lloyd Albin for the report.
Move pgbadger_tools.pl program and README.tools into the tools/ subdirectory with removing the extension. Add more comments and explanations.
Add --analyze option to replace EXPLAIN statements by EXPLAIN (ANALYZE, VERBOSE, BUFFERS).
Allow pgbadger_tools --explain-slowest to automatically execute the EXPLAIN statements an report the plan. See pgbadger_tools --help for more explanation.