Chronology classes

Release name: <Not entered>
Release summary: <Not entered>
Automatic version: 1
Manual version: (1.2)
Published by: <Not published yet>
Created: 5 September 2003 9:03:59 am
Last updated: 15 September 2003 4:33:29 pm
Release note:

1.2 Add Timespan#+ and #- for Ingo (plus Timespan units tests)
Fix installation script to remove spurious Z* subclasses classes from Magnitude.

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SHA checksum: 656436366469630195057364897685218289504785682389