adds cuda timing functions and updates cuda kernel_2
updates .gitignore file; uses cuda d_ibool array with padding; adds wrapper for global memory load function __ldg()
fixed overflow of degrees-of-freedom counters when more that 2 gigapoints; added comment about Zlib -lz to the users manual
Merge pull request #97 from komatits/devel

fixed overflow of degrees-of-freedom counters when more that 2 gigapoints; added comment about Zlib -lz to the users manual
Trick the implicit interface of the adios stub module by calling a dummy function with no interface. Deal with unused variable warnings when not configuring with ADIOS>
Vicious bug fix. Multi GPU per nodes implied multiple synchronizations of the same device when checking error after the call to deviceCount.