Import/Export of Shoebox files.

### Shoebox header information

A shoeboxfile starts with the following line:
`\_sh vN.0 MMM xxx`,
where N is either 3 or 4,
MMM is a three digit number,
xxx stands for a typfile called xxx.typ.

The meaning of N and MMM is unclear.
The parser ignores all information from the first line, and the user has to specify the location of the typfile.

### Introduction of new tiers

Three tiers have a special meaning for the parser and are created when a shoeboxfile is written back from EUDICO for the first time. These are:

1. \eudicop -- the participant (speaker) of this shoebox block.
2. \eudicot0 -- the begin time of this shoebox block in seconds
3. \eudicot1 -- the end time of this shoebox block in seconds

The Datatypes for these tiers are:

1. \eudicop -- [String]
2. \eudicot0 --[long]
3. \eudicot1 --[long]

Example values:

1. \eudicop -- Peter
2. \eudicot0 --1
3. \eudicot0 --1.0
4. \eudicot1 --3.13

It is assumed, that time-linking of Shoebox formatted files will be done on block level only. Time-linking information on annotation level is lost when saving to a Shoebox file.
MK:02/08/02