Fixed note image displayed in reference account column

Issue: #182
Added convenience method #getActiveAccounts to Client
Added option to mark and hide retired portfolios

Issue: #184
Externalized error messages when opening a web browser

Issue: #179
Save and restore selected aggregation period in performance chart

Issue: #174
Fixed button labels for saving chart/column configuration

Issue: #164
Set dirty indicator only if quotes actually changed after online update

Issue: #144
Set dirty indicator only if consumer prices indices actually changed

Also fixed typo 'indeces'.

Issue: #144
Updated project information to user Java-1.6 compiler settings
Merge remote-tracking branch 'upstream/master' into upstream/feature_pdf_import