Moved ContField3D to inherit from DisContField3D.
Incorporated GenExpList1D functionality into ExpList1D.
Tidied up and added documentation to various classes.
Moved Namespace documentation and introductions to separate files along with
doxygen configuration.
Added option to use system ZLIB library instead of libboost_zlib on UNIX.
Added extra search paths to FindMetis.cmake and FindNektar++.cmake.
Updated Linux compiling instructions.
Updated regDemo to use Helmholtz2D-g when built as debug.


git-svn-id: https://gforge.sci.utah.edu/svn/nektar/trunk@2033 305cdda6-5ce1-45b3-a98d-dfc68c8b3305