ENH: support additional command-line loading of libraries (#1414)

- this can be useful for preloading of libraries, or for utilities
  that don't use system/controlDict.

  The additional libraries can be specified individually:

      myUtil -lib lib1 -lib lib2 -lib lib3

  When specified like this, the options add up.

  Or as a 'captured' list using OpenFOAM's standard arg list handling:

      myUtil -lib '(' lib1  lib2 lib3 ')'
      myUtil -lib \( lib1  lib2 lib3 \)

  or as single argument list:

      myUtil -lib '("lib1" "lib2" "lib3")'

  When specified as a single argument, would normally take advantage
  of the transparent handling of word vs fileName and omit the string
  quotes:

      myUtil -lib '(lib1 lib2 lib3)'

ENH: dlOpen error messages now propagated into dlLibraryTable

- this makes the context more relevant and also avoids the previous
  annoyance of double warnings (one from the POSIX loader, and one
  from dlLibraryTable)

STYLE: mark -noFunctionObjects and -withFunctionObjects as 'advanced'

- reduces clutter. Still visible with -help-full