- also have it use LIB_LIBS to always load finiteVolume

which need this functionality.  Solvers will now check the correctness of the BCs on
read.

This reverts commit ff5137e4.
But keeps (cosmetic) changes to bin/foamCleanPath

This reverts commit ad287d9d.

This reverts commit e2968b6a.

- this was not agreed.

This reverts commit 41b196ff.

This reverts commit 54a8b6a1.

 - names updated to reflect what they are based on, e.g. either k
   or U

- simplified the logic
- provide direct link to the respective scripts
- provide help from the respective scripts

- drop reference to license directory
- check -help before checking directories

- search for foamLog.db is more consistent with foamEtcFile
    $HOME/.OpenFOAM/$WM_PROJECT_VERSION
    $HOME/.OpenFOAM
    $WM_PROJECT_INST_DIR/site/$WM_PROJECT_VERSION
    $WM_PROJECT_INST_DIR/site
    $WM_PROJECT_DIR/etc
    $PROGDIR/tools

- old-style (left untouched for now):
  app, lib, run, sol, tut, util

- new-style:
  foamApps, foamLib, foamRun, foamSol, foamTut, foamUtils

- additional aliases:
  userApps, whichFoam

NB: ideally we'd have 'foamSrc' instead of 'src'.
    Do we really need 'foamsrc' and 'foamfv' anyhow?

- rhoCentralFoam

- could also move to utilities/miscellaneous

- the dictionary compare contents might be useful enough to move
  into dictionary code.

- usage example (w/o -rewrite):

      for i in $(find -name fvSolution)
      do
          fvSolutionCombine -case "${i%/system/fvSolution}"
      done