Datafile statistics

[heikkilevanto]

People occasionally ask me how many beers I have in the system. Make a stats page to answer such questions:

• Data file size in bytes
• Total lines in the file,
• Total commeted-out lines, and other comments
• Total data lines
• Number of different record types, including converted Old lines
• Number of different beers, wines, etc
• Number of lines with comments and ratings (maybe for each type)
• Histogram of ratings given
• Average ratings for each year, to see trends
• Number of data files not belonging to me (but show no names)

And maybe more stuff that comes to mind when coding it