Adding setMetric back to AvailIcon and AvailText through MetricMixin.…

… We still need support for that to track plain availability metrics.

Making a small fix to launch page grids to get rid of errors. #45

Fixing font size calculation problem. #42

Fixing avail legends. Regression bug when group support were added.

Experimental implementation to use table of dnd containers in window …

…to handle positioning problems. This is basically a new window type which is opened through dialog where user gives num of rows and cols.

Fixes to charts to work better with theming.

changing default check interval to 1min in MetricStore