Improve code style of inline image code

Please forgive the removal of the line ending ^M below.
I tried for at least half an hour to convince git to ignore this.
Merge remote-tracking branch 'PeterPablo/ACID_improve_inline_image_v2'
Test Harness: fix `extraFunctionFromError`

When the error occurs in the upper stack frame, handling
was impaired, because the upper+1 stack frame was queried.
Instead, now we first initialize the function name to '' and
explicitly check before indexing.

In that case, the function name is not returned, but it is also very
likely the function has not even been called.
Merge `bar`-related tests and `subplot`

The `bars`, `subplotBars`, `hBars`, `stackBars`, `subplot2x2`
were merged into one test.
Subplot3x1 removed
Replace `bodeplots` with `legendsubplots2`
Move `scatter3Plot3` to `issues`
Remove `subplot_colorbar` from test
Merge branch 'simplifyTest'