Add significance stars (SPSS-like behaviour) about rapport HOT 6 CLOSED

Great idea, thanks!
Will tweak correlation.tpl to do so and also add some helpers for creating correlation matrices with stars - also for pairs plots.
I'll add milestone 0.2 to this issue not to get too lazy :)

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Half done in aL3xa/rapport@fa65500: rp.cor.plot shows those red stars now (see correlations.tpl for demo).
Will update the tpl too for tables.

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Added stars to corr table too in aL3xa/rapport@406f067.

Please check out after rebuild:

    rapport('correlations', data=ius2009, vars=c('age', 'it.edu', 'it.leisure'))
    tpl.export(rapport('correlations', data=ius2009, vars=c('age', 'it.edu', 'it.leisure')))

Closing this now, please reopen if you had something different in mind.

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I reopened this one because I think this shouldn't be done only for correlation tables, but globally. Helper functions should be written, and/or custom class should be assigned to column in data.frame or so... which holds p-values. Will think about this, though, but let's make this issue open for now.

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Okay, I have an idea which can be handled with a simple function named to eg. rp.add.stars.

My idea in a nutshell which would work with vectors and data.frames (we/template writers can deal with this limitation IMHO): add an attr named to p.value to each element/column of the R object, and the function would return automatically the R object with the same dimensions/names/row.names etc. but with stars added (converted to character).

This way we would not require a new class which would result in difficulties to pass to ascii etc. I would happily implement this if you agree.

POC demo:

> (x <- data.frame(var=1:2))
  var
1   1
2   2
> attr(x$var, 'p.value') <- c(0.01, 0.9)
> str(x)
'data.frame':   2 obs. of  1 variable:
 $ var: atomic  1 2
  ..- attr(*, "p.value")= num  0.01 0.9
> rp.add.stars(x)
  var
1   "1 **"
2   "2"

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Closing here, this is a pander issue.

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