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

Line statistics are gathered correctly (again).

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).

Added alts for imgs, missing ul tag, fixed CSS.

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