Update To Latest Environment on Titan (Oak Ridge)

- add picongpu.profile example (put it in your $MEMBERWORK/[projid]/)
LD_PRELOAD not rly needed

- by changing the LD_LIBRARY_PATH of self-compiled libs to be
appending instead of pre-pending, the work around was not
necessary any more :)
- I still leave it in since it becomes useful from time to time
Add libSplash environment example
Added MXML environment for ADIOS
Add DataSpaces library
Merge pull request #263 from ax3l/doc-titanUpdate

Update To Latest Environment on Titan (Oak Ridge)