OpenACS

The timezone data from IANA has changed (probably several years ago),

and the min/max years have to be changed to -2147481748/2147485547,

which are no acceptable years for timestamps in PostgreSQL and

Oracle. The new timezone data maps now these boundary values 1/9999.

This commit fixes as well a bug introduced by the last version of the

timezone data in cases, where Tcl versions with older timezone data

were used, and the fallback operations based on Tcl failed. Tcl

versions 8.6.14* and Tcl 9.0* have up-to-date time zones, e.g. Tcl

8.6.13 still requires in some rare cases the fallback to the database,

where the error might show up.

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