Planned increment for package Datetime

[Mario Amado Alves <maa@di.fct.unl.pt>]

Still a propos the date formats issue. Fresh news. Excerpt from
"http://lexis.di.fct.unl.pt/ADaLIB/datetime.htm":

"""
Planned increment: extension to other formats

An enumeration listing all implemented formats:

  type Formats is (Default_Format, ...);

where Default_Format is the 27-characters adjustable format descibed above.
Functions with a corresponding additional optional argument:

  function Value(
    Datetime: in String;
    Format: in Formats := Default_Format)
    return Time;

  function Image(
    Time_Value: in Time
    Format: in Formats := Default_Format)
    return String;

Function bodies incremented accordingly. Use a case construct on Format.
Because the Format parameter is optional, the increment is backward
compatible.
"""

Effecting this increment is left as an training exercise to the students
who originally sought a "calander" (sic) package ;-)

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