Returns the string used for the issue number in the format:<br/>
Issue No.<is1>-<is2>/<year> - <date>, <br/>
e.g. Issue No.32-33/2007 – Tuesday 6 August 2007
if <code>estimate_release_date</code> is set to <code>yes</code>,
a 'theoretical' release date is shown instead of the release date:
if issue if released on Friday, display next week date. Also if
journal has not been released, display an approximative release
date (based on history and config)
@param display_date: if 'yes', display issue date
@param display_issue_number: if 'yes', display issue date
@param estimate_release_date: if 'yes', display the theoretical release date
@param granularity: <code>day</code>, <code>week</code> or <code>month</code>
@param group_issues_date: if 'yes' and issue are grouped, display first issue date of the group
@param display_month: type of display for month: 'short' ('Jan', 'Feb', etc.) or 'long' ('January', 'February', etc.)
@param display_week_day: Can display day of the week ('Monday', etc.). Parameter can be 'short' ('Mon', 'Tue' etc), 'long' ('Monday', 'Tuesday', etc.) or '' (no value displayed)