DPH tests disabled in nightly build

All,
Were the DPH tests disabled in the nightly build on purpose? If they are taking too long then we could just reduce the optimisation level rather than disabling them completely. These programs produce a vast amount of core code, and are a stress test for the simplifier and code generators.

I went to fix #7192, but now the test case, dph-diophantine-opt seems to be failing for some unrelated reason. 

Ben.



am-deb7-64 (HEAD), build 236, Success

=====> dph-diophantine-copy-fast(normal) 3204 of 3489 [18, 7, 0]
cd ./dph/diophantine && '/home/butler/b/builder/tempbuild/build/bindisttest/install   dir/bin/ghc' -fforce-recomp -dcore-lint -dcmm-lint -dno-debug-output -no-user-package-db -rtsopts -fno-ghci-history -outputdir fast --make -o dph-diophantine-copy-fast Main  -O -fno-enable-rewrite-rules -package dph-lifted-copy  >dph-diophantine-copy-fast.comp.stderr 2>&1
Compile failed (status 256) errors were:
<command line>: the dph-lifted-copy package is not installed.
To install it: "cabal install dph".