examples/fluids: Max Error -> Relative Error

ETV: Pass currentTime (instead of time) to Exact_Euler()

ETV: added lz=1 and fixed max time to the arguments of the convergence tests

ETV: Updated the post-processing scripts

ETV: Changed the conditional statement for identifying in/outflow faces to fix the artifact in linear translation cases

style

ETV: fixed an extra sign in S_bubble

examples/fluids: fix entropy for vortex vs bubble

ETV: turn off wall and slip BCs ( in the x and y directions) in SetUpDM() instead of CreateOperatorForDomain()

examples/fluids: fix Euler vortex initial condition

examples/fluids: fix stale debugging pressure

ETV: fixed the zero velocity test cases on the boundaries (had to apply EulerContext for the boundaries as well)

use a better command line for turning off time stepping

ETV: use enum and command line options for the test cases

ETV: added more specific conditional statements for the in/outflow formulations

Default P_inlet 1. -> 1.e3 so that it becomes 1 after the unit conversion

fixed the bug in Euler context (Setup and surface contexts still don't work for advection(2d))

style

WIP: (BUG) fixed in/outflow formulations but there is a bug in the context and also advection(2d) breaks

mms BCs -> wall BCs

added Euler_Sur

Added required variables to surface context

removed some todo comments

removed periodicity

Initial commit for replacing periodic BCs with in/outflow BCs => added support for in/outflow in navierstokes.c