It's a bug that processing currently stops when it hits a read-only
file. This is yet another case we'll want our test suite to cover.
own parser for the query string rather than using Xapian's QueryParser
class.
+Make failure to read a file (such as a permissions problem) a warning
+rather than an error (should be similar to the existing warning for a
+non-mail file).
+
Add support for files that are moved or deleted (which obviously need
to be handled differently).