convergence_plot.py: modified to plot loglog

gitignore: adding *.png for ignoring convergence plots

Debugging: q[3]=0 since we have slip bc in the z direction

verification-test.sh: specify number of faces in the z direction = 1

Debugging: perform the tests in one ts to investigate the bugs in the spatial discretization

Some changes in E based on the given formulation in the paper

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debugging: added some if-statements momentarily

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added the plotting command in the bash script for now

adding the plotting python script for now

ETV: fixed the title and info of the paper

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examples/fluids: fixed a typo in all examples

examples/fluids: fixed some missing parts and updating EULER_VORTEX after merging #596

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examples/fluids: added a bash file to get verification test results in .log files. TODO: add test flags to be able to change the test setup through run time arguments.

ETV: Defined a separate variable for mean velocity instead of using wind[3] which was previously defined for Advection(2d) problems

EULER_VORTEX: periodicity for x and y directions added

Removed unused variables and In/OutFlow setup for EULER_VORTEX

examples/fluids/navierstokes.c: small fix in comments

EULER_VORTEX: all QFunctions are using same context

fluids/navierstokes: fix pointer semantics for Euler context

updated euler_vortex context

WIP: defined a new struct for euler_vortex