In dielconst/*/*.m, material name is printed on the plots
shape/CircularShellCylinder.m is added
In io/Scalar3d.m, value() is corrected to take an array of x, y, z.  Need the same correction in io/Scalar2d.m
doc for base/istypesizeof.m is updated.
Initial working version with anisotropy support
example/2d/planesrc_anisotropy_2d.m is added
io/array2scalar.m is modified to simplify its usage
io/build_system.m prints out anisotropic eps correctly
the static function of material/Material.m is renamed from create() to fromtable(); material/Material.m provides methods for checking isotropy
Basic supports for iterative method in io/maxwell_run.m; the convergence is not good, and the reason needs to be figured out