Updated CMake build system to use a top-level CMakeLists.txt.
All libraries, solvers, demos, regressionTests and utilities now built using a single configuration/build cycle. Each component build can be enabled/disabled by the user. Cleaned up CMake configuration and moved non-essential options to Advanced. git-svn-id: https://gforge.sci.utah.edu/svn/nektar/trunk@3628 305cdda6-5ce1-45b3-a98d-dfc68c8b3305
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