[Gnumed-devel] data pack feature finished

[Karsten Hilbert]

I have committed the data pack installation feature.

This will allow us to update reference data as needed.

Data packs are defined in a file whose URL is configurable.
Said file defines the names of data packs and where to find
them. The client will load the list, let the user select,
load the data pack, verify the md5 sum, and install the data
pack.

The pack must be a zip file and contain an SQL script
install-data-pack.sql. The SQL script is not supposed to
fiddle with transactions itself (that is, no BEGIN / END /
COMMIT / ROLLBACK). Judicious use of SAVEPOINTs is OK,
however.

Karsten
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