err: Customizable Object Sensitive Messages
Messages should provide users with readable information
about R objects without flooding their console.
'cc()' concatenates vector and data frame values
into a grammatically correct string using commas, an ellipsis and conjunction.
'cn()' allows the user to define a string which varies based on a count.
'co()' combines the two to produce a customizable object aware string.
The package further facilitates this process by providing five 'sprintf'-like
types such as '%n' for the length of an object and '%o' for its name as
well as wrappers for pasting objects and issuing errors, warnings and messages.
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