Return to bar chart links refer to one hospital/unit when charts are split

[Ed McDonagh]

Should ideally refer to what the chart is, ie 'Plot of mean DAP per study description' or whatever.

[David Platten]

Button to return from histogram now displays the title of the main plot rather than a specific series. Fixes issue #357.

→ <<cset 4283970c9750>>

[David Platten]

Forced the the first letter of the title text used to construct the button label to be lower-case. References issue #357.

→ <<cset a3e21b41feee>>

[David Platten]

Updated changes files. References issue #357.

→ <<cset e82312559013>>