[developers] [incr tsdb()] freezes after processing test suite

[Guy Emerson]

I'm running TSDB on the Ubuntu+LKB VirtualBox appliance (v23), but after
running it on a test suite, it stops responding, and the cursor turns into
a skull-and-crossbones (!).  If I re-open TSDB, the results are there, and
I can analyse the results as normal.  The emacs buffer prints one line for
each test item, and then:

flush-cache(): flushing `abui/2017-04-26_21:26:00_utc/lab4/17-04-26/lkb'
cache ... done.
main(): unable to write to history file `.tsdb_history'.
close-connection(): `abui/2017-04-26_21:26:00_utc/lab4/17-04-26/lkb' expiry.
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