t.maint fails with QDBM -- DB and TDB are fine

[Matthias Andree]

Hi,

t.maint fails when the package is used with QDBM. I suspect the QDBM
iterator breaks when tokens are removed while the iteration is in
progress, man depot(3):

  "char *dpiternext(DEPOT *depot, int *sp); [...]
   It is possible to access every record by iteration of calling this
   function. However, it is not assured if updating the database is
   occurred while the iteration. [...]"

If that's really the case, we'll need to build a list of "tokens to be
removed" and flush them after traversal.

I'm not going to check or implement anything now, so feel free.

Cheers,

-- 
Matthias Andree

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