create database report

[westram]

Add a script that generates a report about data layout of a database.

Scope of the report:

• Trees (name, leafs, groups)
• SAIs (name, group, alignments)
• Alignments (name, type, length, frequency)
• Selections (name, contents)
• Species (count, marked, fields)
  • detailed information about fields:
    name, type, protections, frequency

Emphasis should be placed on formatting the generated reports to facilitate comparison using diff viewers like meld or kompare.

[westram]

• implemented with r19509

[westram]

done with r19511 + r19512