- eg,
    labelUList  <-> labelList
    scalarUList <-> scalarList
    ...

Note the unallocLabelList typedef is still available.
However labelUList requires less typing (10 vs. 17 chars) and has a
more obvious to labelList.

- otherwise gets flagged as an error by clang

- otherwise gets flagged as an error by clang

- avoid name collisions with future thermal models etc.

Improves boundary handling
Corresponds better to FVM equations

ENH: allow construct from UList of coefficients, from C-arrays
     avoid uninitialized values for null constructor

    OLD timings:
    ~~~~~~~~~~~~~~~~~~
    evaluate:     -6.82572e+31 in 10.38 s
    hard-coded 0: -6.82572e+31 in 0.2 s
    hard-coded 1: -6.82572e+31 in 10.37 s
    hard-coded 2: -6.82572e+31 in 0.24 s

    New timings:
    ~~~~~~~~~~~~~~~~~~
    evaluate:     -6.82572e+31 in 0.11 s

Conflicts:
	ReleaseNotes-dev