Upgrade JDB to 1.7.

From the change log:
1.7,  5-Jan-00
- NEW: dbcolize now detects and rejects lines that contain embedded
	copies of the field separator
- NEW: configure tries harder to prevent people from improperly
	configuring/installing jdb
- NEW: tcpdump_to_db converter (incomplete)
- NEW: tabdelim_to_db converter:  from spreadsheet tab-delimited files to db
- BUG FIX:  dbjoin used to produce incorrect output if there
	were extra, unmatched values in the 2nd table.
- BUG FIX:  the sample commands in the usage strings
	now all should explicitly include the source of data
	(typically from "cat foo.jdb |").
- DOCUMENTATION BUG FIX: dbcolmovingstats had incorrect sample output.

1.6, 24-May-99
- NEW: dbsort, dbstats, dbmultistats now run in constant memory
	(using tmp files if necessary)
- NEW: dbcolmovingstats does moving means over a series of data
- NEW: dbcol has a -v option to get all columns except those listed
- NEW: dbmultistats does quartitles and medians
- NEW: dbstripextraheaders now also cleans up bogus comments
	before the fist header
- BUG FIX: dbcolneaten works better with double-space-separated data

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