Bug 1078979 - Add more testing of dmd.py. r=erahm.

--HG--
rename : memory/replace/dmd/test/full-heap-expected1.txt => memory/replace/dmd/test/full-heap-empty-expected.txt
rename : memory/replace/dmd/test/full-heap-expected4.txt => memory/replace/dmd/test/full-heap-sampled-expected.txt
rename : memory/replace/dmd/test/full-heap-expected2.txt => memory/replace/dmd/test/full-heap-unsampled1-expected.txt
rename : memory/replace/dmd/test/full-heap-expected3.txt => memory/replace/dmd/test/full-heap-unsampled2-expected.txt
rename : memory/replace/dmd/test/full-reports-expected1.txt => memory/replace/dmd/test/full-reports-empty-expected.txt
rename : memory/replace/dmd/test/full-reports-expected4.txt => memory/replace/dmd/test/full-reports-sampled-expected.txt
rename : memory/replace/dmd/test/full-reports-expected2.txt => memory/replace/dmd/test/full-reports-unsampled1-expected.txt
rename : memory/replace/dmd/test/full-reports-expected3.txt => memory/replace/dmd/test/full-reports-unsampled2-expected.txt
extra : rebase_source : 6fc66545db4422a9cd38d734db2b76d3b9b25880
Bug 1078981 - Teach dmd.py how to handle gzipped files. r=mccr8.