removed another debug comment

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/zoo@1000 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
added test case for na.fill bug fix

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/zoo@1001 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
updated output to recent additions in examples

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/zoo@1002 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
improved na.fill fix for the case where 'fill' is actually empty

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/zoo@1003 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
read.zoo heuristic in toDefault now can actually capture POSIXct (and not only Date as before)

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/zoo@1004 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
more cautious comments about the heuristic

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/zoo@1005 edb9625f-4e0d-4859-8d74-9fd3b1da38cb