Printing location when downloaded input data checksum is different

There are many different directory trees involved in Maneage system: the
top directory, the 'reproduce/' directory and its sub-directories,
'.build/' (that point to a user-defined build area), and a possibly
user-defined input directory. Until now, in the case of a download checksum
failure, it was not immediately obvious [1] to the user *where* the file
with a failed checksum is.

To clarify to the user *where* the suspicious file is now located, this
commit adds a line to 'reproduce/analysis/make/download.mk' to print out
this full path location: '$$unchecked' along with the expected and
calculated checksums.

[1] Euphemism for me spending lots of time debugging and being confused.

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