Upstream changes:
Changed in xts 0.11-0:
o Fix make.index.unique() to always return a unique and sorted index. Thanks
to Chris Katsulis for the report and example (#241).
o Add window.xts() method and completely refactor the internal binary search
function it depends on. Thanks to Corwin Joy for the PR, tests, review, and
patience (#100, #240).
o Better axis tick mark locations for plots. Thanks to Dirk Eddelbuettel for
the report (#246). Also incorporate axTicksByTime2() into axTicksByTime() to
reduce code duplication from the migration of quantmod::chart_Series() to
xts::plot.xts() (#74).
o Add details to plot.xts() parameters that are periodicity, now that RStudio
has argument completion. Thanks to Evelyn Mitchell for the PR (#154).
o periodicity() now warns instead of errors if the xts object contains less
than 2 observations (#230).
o first() and last() now keep dims when they would otherwise be dropped by a
regular row subset. This is consistent with head() and tail(). Thanks to
Davis Vaughan for the report (#226).
o Fix subset when ISO8601 string is outside the valid range, so it returns no
data instead of all rows (#96).
o Avoid partial name matches from parse.side() (inside .parseISO8601())
results that are passed to firstof() and lastof(). Thanks to @gp2x for the
report and the patch (#231).
o na.locf.xts() now loops over columns of multivariate objects in C code,
instead of in R. This should improve speed and memory performance. Thanks to
Chris Katsulis and Tom Andrews for their reports and patches (#232, #233,
#234, #235, #237).
o Change plot.xts() default 'pch = 0' (rectangles) to 'pch = 1' (circles) so
it looks more like base and zoo plots (#203).
Changed in xts 0.10-2:
o na.locf.xts() and na.omit.xts() now support character xts objects. Thanks to
Ken Williams and Samo Pahor for the reports (#42).
o na.locf.xts() now honors 'x' and 'xout' arguments by dispatching to the next
method (#215). Thanks to Morten Grum for the report.
o coredata.xts() now functions the same as coredata.zoo() on zero-length
objects, and only removes xts-related attributes (#223). Thanks to Vincent
Guyader for the report.
o plot.xts() no longer ignores 'col.up' and 'col.dn' when 'type="h"' (#224).
Thanks to Charlie Friedemann for the report. This was inadvertently broken
as part of the fix for #210.
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