The its package contains an S4 class and some functionality for handling
irregular time series.

For correct installation on Windows, the zip file should be installed using
Rcmd INSTALL --save its.  Installation using install.packages() resulted 
in generic functions loading into .GlobalEnv, where they could be deleted or 
corrupted.

Thanks to John Chambers and others for help, and to Adrian Trapletti and
others for encouragement - and of course they have no responsibility for
any shortcomings.

Version 0.1.1 is tentative, and feedback is welcome.
Version 0.1.2 has some minor improvements:
                documentation
                at is passed to axis.POSIXct in plot for tickmark control
                plot now has additional options for handling NAs
                
