[Rd] several bugs (PR#918) lists and matrices

[Rich Heiberger]

## Thomas rightly points out that list() is not the best structure for
## homogeneous data.  My example was the simplest that generated the
## error of a matrix structure that that doesn't work.  The application
## that this is simplified from needs lists because the data isn't
## homogeneous.  I am attempting to write a missing value class, where
## each item is a list.  In the simplest instance, if the datum is missing
## then the attribute contains the reason.
## 
## Both of the 'bugs'/'unimplemented features'
## 3. a <- matrix(list(1,2,3,4,5,6), 2, 3)
## 6. bug in "[" for lists
## show up in this example.  Thus

x <- list(1,2,3,4,5,6)
dim(x) <- c(2,3)
x[[2,3]] <- NA
attr(x[[2,3]],"mv") <- "absent"
x
for(i in x) print(i)
x[2,]
x[1,1]
x[2,3]

Rich
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