ENUM numbers

[pcarruscag]

@bigfooted @vdweide
Line 5320 of CPhysicalGeometry.cpp:
if(nSpanWiseSections[INFLOW -1] != nSpanWiseSections[OUTFLOW - 1]){

We are indeed relying on at least one enum having specific values.

[vdweide]

Thanks @pcarruscag for finding out. Too bad this is the case though.

[bigfooted]

INFLOW=1, OUTFLOW=2. Do we really need an enum for this?

[pcarruscag]

Another good example of where things would break found by @TobiKattmann are the enums that start at 1 to then use a "NONE" case defined somewhere else, the NONE (0) case is often implicitly converted to boolean.
So I think the only safe way to go about this is to replace normal enum by enum class as Tobi started doing in #1242.
Off course, for those where the numbers already start at zero it would also be safe to delete them.