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.

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