Removed "show variables" button. Checking the variables in the current time period is done after each time period change. Create zoom buttons initially but only enable them after a plot is made.
Removed "show variables" button. Checking the variables in the
current time period is done after each time period change.
Create zoom buttons initially but only enable them after
a plot is made.

ncareol/R-eol,ncareol/R-eol,ncareol/R-eol