dielconst/Palik/GaAs.{m,mat} is added
The data sources for silicon in Palik is more carefully selected
linewidth can be controlled for 2D visualization
example/2d/planesrc_2d.m has code to evaluate the performance of PML
Fix minor typo in io/Scalar3d.m
example/2d/pc_2d_basic.m uses frequency in a photonic band gap
New document directory structure is prepared
doc/src and doc/tutorial is added
example/2d/ has cylinder_2d.m, diel_slab.m, mdm.m