BLD: Travis changes
BLD: Load blitz++ form sourceforge.
BLD: We do not need blitz++ inside travis then.
BLD: cmake dependencies.
BLD: Patch the Qwt build.
BLD: Remove omp on linux for now.
BF: Need to explicitly include cstdio for newer gcc.
BLD: .dylib for APPLE, .so for LINUX…
BLD: Need to include libdl on linux.
BLD: Make build on travis non-parallel and verbose for easier debugging.
BLD: Download from plain http URL and not from SVN.
BLD/FO: Build cleanup.