Determine releases automatically from Debbugs::Config
Replace all hard coded release aliases everywhere except for dohtml
debian sources and ftproot were completely wrong in bugcfg.pm
fix lack of oldstable in disttags
it's bugcfg not bug_cfg
fix bugcfg usage in bugcounts
Make RC bug graphs for the last month and since the last release

Closes: #431299

Signed-off-by: Don Armstrong <don@donarmstrong.com>
Link to new graphs in the generated html

Signed-off-by: Don Armstrong <don@donarmstrong.com>