Issue 27: Indexing of .dvi.gz with double space in filename fails

Recoll can index a .dvi files with double spaces in its filename but not so .dvi.gz files. rcluncomp would uncompress "a b.dvi.gz" to "a b.dvi" in some temporary directory. But rcldvi tries to process the non existing file "a b.dvi" (only a single space).

rcluncomp had trouble with multiple whitespace in file names because it used echo for output. Replaced by here document. Closes issue #27

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