R-alpha: Second patch for 0.50-a1

[Ross Ihaka]

A second patch for R-0.50-a1 is available from
	ftp://stat.auckland.ac.nz/pub/R
The patch produces the following changes

 o  cpoly problem with pow_di fixed.

 o  legend had a call to "text" with an incorrect argument tag.
    Changed "text" to "labels".

 o  The variable "dup" was uninitialised in the function "naoktrim" in
    src/main/dotcode.c.

 o  There have been some fixes to the color support code and there
    is now a function palette which allows a user to specify the
    palette to be used when the value of col= is numeric.

 o  Problems pointed out in "unlist" are fixed.

 o  A parsing problem for "if" statements in argument lists is fixed.

Enjoy
	Ross
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