Implemented system test for reading spins from a NMRPipe SeriesTab formatted file, where the assignments for second dimension is missing.

This will be a typically export from SPARKY, converted to NMRPipe format, and proÂcessed with SeriesTab.

Work in progress for Support Request #3044, (https://gna.org/support/index.php?3044) - Load spins from SPARKY list.
Fixed for reading spins from a NMRPipe SeriesTab formatted file, where dimension 2 misses residue number and residue name.

Work in progress for Support Request #3044, (https://gna.org/support/index.php?3044) - Load spins from SPARKY list.
Expanded the warning message for a systemtest.

Work in progress for Support Request #3044, (https://gna.org/support/index.php?3044) - Load spins from SPARKY list.