A tweak to column alignment for the mext script

I tweaked the mext script so it auto-detects the necessary column widths for each sample.

Get mext here.

I'm Baron Schwartz, the founder and CEO of VividCortex. I am the author of High Performance MySQL and many open-source tools for performance analysis, monitoring, and system administration. I contribute to various database communities such as Oracle, PostgreSQL, Redis and MongoDB.