#42 Improved debugging support for OpenJade

[Falkan]

This patch against 1.3.2 adds two new
external-procedures to openjade:

1.) (node-list-debug message snl)
Works like debug with the difference that the location
printed with
the message can be set to a snl. (debug only prints the
localen inside
the DSSSL script)

2.) (node-list-location snl)
Yields the location of snl in the following form:
"storageID:lineNumber:columNumber"
In most cases the storage ID is the actual file name
where the snl
actually lies. On generated snls node-list-location may
yield #f.

[Falkan]

see long description