more formulas: fix typo, define mach number
prototype implementation of 1d sodtube analytic solution by command pattern
fix typo and add a simple script for testing
add caculating analytic solution command
add DUMPGRID command and rename getgrid to be gengrid, implement gengrid
add command dump analytic region4
change naming convention IV to be 4
change naming convention III to be 3
change naming convention II to be 2
change naming convention II/III/IV to be 2/3/4
change naming convention I to be 1
change naming convention V to be 5
follow pep8 naming style, move get to be get_
follow pep8 naming style, move set to be set_
follow pep8 naming style, move Analytic to be analytic_
follow pep8 naming style, move Velocity to be velocity_
follow pep8 naming style, move Pressure to be pressure_
follow pep8 naming style, move Density/Region to be density_/region
follow pep8 naming style
follow pep8 naming style