Let tilde expansion be done even if a file/directory doesn't exist yet.

This makes such natural commands as "MKD ~user/newdir" or "STOR ~/newfile"
do what they are supposed to instead of failing miserably with the
"File not found" error.

This involves a bit of code reorganization.  Namely, the code doing
glob(3) expansion has been separated to a function; a new function
has been introduced to do tilde expansion; the latter function is
invoked on a pathname before the former one.  Thus behaviour mimicing
that of the Bourne shell has been achieved.

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