TUT: clean up multiphase tutorials

WIP to ensure bitwise regression.

FYI: @Prashant

FYI-relevant to .org files: @mark @albertop

changed milestone to %v2006

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@kuti - Nice to see this clean-up. Lots of work there.

Didn't check for it in the changes - do the PDRFoam tutorials now use the update thermo specs?

@kuti - looks good

• General rule for setting purgeWrite to 10?
• Need to check for possible regressions before merge

General rule for setting purgeWrite to 10?

The sole motivation was to manage disk space in a more economic way (e.g. I'm not able to run the multiphase tutorials in my workstation due to exceeding disk space). Yet I think 10 might be very low for some cases.

Might consider a higher cap, 50? 100? - or reinstantiate to 0?

Probably leave as-is for now.

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unmarked as a Work In Progress

good to go @andy, if @Prashant gives the green light.

@Prashant :

• I verified bitwise regressions for all the changes (except one case where the tutorial was not executing the main application at all, I enabled the solver).
• I have moved some of the files in and out TUT/resources, so sourcing etc/bashrc for an existing installation should be problematic since old compilations will not find the resource file paths required by some of the tutorials.
• The same OF compilation should be used to test for the branch with and without the commit since some changes have been made in multiphase tutorials during the last three weeks.
• There might still be something that I have missed, sorry for them - though chances are lowered.

Thank you!