Changed list(.) to copy(.) to please r-devel and future versions

Changes to radix orders for R-devel - Passing explicit copy(.) instead of list(.) in radix orders as R>3.0.2 will not make copy.
Minor change to sortedMatch - defined NA and NaN up-front .

git-svn-id: svn+ssh://svn.r-forge.r-project.org/svnroot/datatable@1054 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
properly assigning unsigned long values of NA_REAL and NaN

properly assigning unsigned long values of NA_REAL and NaN

git-svn-id: svn+ssh://svn.r-forge.r-project.org/svnroot/datatable@1055 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Fix for NA/NaN in radix order

1) Fix for NA/NaN in radix order for numerics in 32 bit
2) NA is sorted before NaN now (as intended previously) for numeric

git-svn-id: svn+ssh://svn.r-forge.r-project.org/svnroot/datatable@1056 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Long outstanding memory leak in grouping fixed; e.g. #2648.

git-svn-id: svn+ssh://svn.r-forge.r-project.org/svnroot/datatable@1057 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Update to NEWS item only.

git-svn-id: svn+ssh://svn.r-forge.r-project.org/svnroot/datatable@1058 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Merge branch 'refs/heads/r-forge-git-svn-local'