pivot-table: Include pivot table subtype in pivot_table_dump() output.
[pspp] / src /
drwxr-xr-x   ..
-rw-r--r-- 1654 automake.mk
drwxr-xr-x - data
drwxr-xr-x - language
drwxr-xr-x - libpspp
drwxr-xr-x - math
drwxr-xr-x - output
drwxr-xr-x - ui