In particular, recognize the summary vectors
- SDENx -- Phase density of phase 'x' (segment conditions)
- SDENM -- Fluid mixture density without flowing fraction exponents
- SMDEN -- Fluid mixture density with flowing fraction exponents
If the user did not set MULTNUM but has e.g.
```
MULTIREG
PORV 0.8 2 /
PORV 0.8 7 /
PORV 0.8 3 /
PORV 0.8 8 /
PORV 1 4 /
PORV 1 9 /
/
```
he at least gets a warning like
```
Warning: MULTNUM region 2 has no active cells when processing operation MULTIREG on keyword PORV.
Please check whether this is on purpose or you missed defining the region properly.
In file /path/to/model/porvmultsny.inc, line 1
```
This should aid him with detecting possible errors.
This commit adds the requisite backing storage and parser support
for capturing and transporting simulator-level calculation of phase
and mixture density value for purpose of summary file output. To
this end, make 'SegmentQuantity' into a template on a set of defined
items and make SegmentPhaseQuantity into a specialisation of this
template. Add a new specialisation, SegmentPhaseDensity, which
holds phase densities (oil, gas, water), and fluid mixture densities
with and without flowing fraction exponents.
These will be used to transport the values needed to output segment
level summary vectors
SDENx -- Phase density of phase 'x' (O, G, W)
SDENM -- Fluid mixture density without flowing fraction exponents
SMDEN -- Fluid mixture density with flowing fraction exponents
Mostly to aid future maintenance. While here, also re-indent the
other unit tables and add a type alias (UnitTable) to avoid spelling
out the 'unordered_map<>' type repeatedly.
In particular, add support for
SxFT - Cumulative flow of phase 'x'
SxFV - Free flow velocity of phase 'x'
SxHF - Free flow holdup fraction of phase 'x'
SxVIS - Phase viscosity of phase 'x'
The last three of these were added to the RFT file in 802a401a8,
but are also useful in the summary output file. In the interest of
avoiding duplicate logic, refactor the existing segment-related
quantity calculation/extraction in terms of callbacks.
```
Error: Unknown keyword: KEY6
Error: Unrecoverable errors while loading input: Problem with keyword
In <memory string> line 0
Unknown keyword: KEY6
```
does not tell the user where his/her error is.
This is now changed to
```
Error: Unknown keyword: KEY6
Error: Unrecoverable errors while loading input: Problem with keyword NE6
In /path/to/include/grid/file.inc line 7
Unknown keyword: KEY6
```
which gives the user a greater chance of finding out what is wrong.
