added option show_classes for print.tbl_df

[w9]

Adding option show_classes for print.tbl_df

I think being able to see classes directly would drastically increase my productivity and lower the chance of mistakes. Especially sometimes I need to distinguish between character and factor, or between double and integer etc. Plus, we have class names for omitted columns then why not the columns that are actually shown?

Adding option m for print.tbl_df

Instead of printing the top 10 by default, I changed it to printing 5 top and 5 bottom. Users can set the added m option to change how many bottom rows to show. Now the option dplyr.show_min will dictate the default values of both n and m, and is set to 5.

I made so that setting one of n or m without the other implies the other to be 0. So the behavior of previous code print(n=...) will not change.

[hadley]

I don't think this needs to be an option - it should always happen. Can you please:

• fix the mangled code
• use () instead of <> (to be consistent)
• add a bullet point to NEWS

[cosinequanon]

This is cool, would love to see it actually merged

[lock]

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