Only names are shown for the next 5.

Two executions of 'git-rev-list' were merged and python used instead of sh
snippet. From initial testing this seems to _slow_ things down.

Get total lines of code from "git-log --shortstat" instead of "cat".

Headers are now created using html_header() function.

This name change was done just in case the statcvs/statsvn folks plan on making
a git version at some point in the future (the projects seem to share
developers).

Also fixed the script to find gnuplot files with glob.glob().