added another example for second y-axis

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/zoo@987 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
ylabs of class 'call' are now coerced to 'expression' because otherwise rep() and [ do not work

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/zoo@988 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
added cycle/quarters/months methods for yearmon/yearqtr

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/zoo@989 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
cycle now does not return integers

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/zoo@990 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
removed debug comment

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/zoo@991 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Added dim<-.zoo method that tries to catch non-sensical usages of
dim<- (prompted by a request by Bill Dunlap)


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/zoo@992 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
as pointed out by Bill Dunlap deparse(substitue(x)) can lead to problems
when generating column names in the as.matrix and as.data.frame methods,
now deparse(substitute(x), width.cutoff = 100L, nlines = 1L) is used



git-svn-id: svn://svn.r-forge.r-project.org/svnroot/zoo@993 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
fixed time width example

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/zoo@994 edb9625f-4e0d-4859-8d74-9fd3b1da38cb