Fixed bug #794: Excessive memory when searching the LoC only.

Fixed bug #794: Excessive memory when searching the LoC only.
The bug was due to a buffer overrun in reclist_insert. Basically
the size could exceed that of flatlist_size. Reason is that
for LoC (or other target) we get 15 records at a time. 7*15 =
105 > 100 (expected_maxrecs). The buffer overrun made relevance_newrec
allocate very large nmem block. After that the tried would eventually
make a bad ptr reference. reclist_insert now returns 0 if there
is not enough room for a new record. Function ingest_record sees that
and does not process the record further. This bug was not relatd to
UTF-8 problems.