lei q: fix --import-before default and FIFO output
commit
6c551bffd75afb41d9b5e4774068abe7e06ed0e7
("lei q: --import-augment for mbox and mbox.gz") added a check to
in _pre_augment_mbox for the option being a ref() to distinguish
between default values and user-supplied values (which are
non-ref SCALARs from Getopt::Long).
However, LeiQuery failed to use a SCALAR ref as the default
value, making the check in _pre_augment_mbox useless. We
now update LeiQuery to use \1 instead of 1 as the default
value so "lei q -f mboxrd ..." to stdout works once again.
Unfortunately, testing with redirects pointed to regular
files didn't trigger the code paths being updated. Testing
with a FIFO revealed further bugs in the FIFO handling code
which are also fixed in this commit.
We'll also update the $lei->out error message to be
less-specific about "stdout" and use the term "output", instead,
since LeiToMail replaces stdout for all mbox outputs.