Package cve-backup: Information

- Results of mapping are stable, including cases where a mapping choice consists
  of multiple products (a same string value is produced for a same set of
  matched product names);
- Reports with new issues have the same format even if there are no new issues
  (there is no special format for this case anymore).

- Fixed cpe-map-choice module (the bug was introduced in the cve-manager v0.55);
- Improved user interface of the cve-monitor;
- Slightly changed format of cve-monitor "diff" reports (a modified header and
  an absence of a footer).

- Ability to assign multiple product names to a single package using a list
  of prescribed mapping pairs;
- Slightly changed format of some types of cve-monitor reports (a modified
  header and an absence of a footer).