I plan to release a bug fix release (0.1.5) within the next couple of days. Adding date ranges broke merging and several of the report generators. If you uncover any bugs in next couple of days, please let me know, so I can try to get them in this release.
Report generation in PDF format may be added. OpenOffice has been the only target platform that can deal with all the reports, yet it appears to have some problems on a few of the Linux distributions (such as Debian). PDF will allow just about everyone to generate (but unfortunately, not to edit) reports.