- the previous check didn't catch bad cellZone names when running in
  parallel

- now export FOAM_CASE and FOAM_CASENAME environment variables from
  getRootCase() so they can be used immediately (eg, in decomposeParDict)
  instead of crashing!

- following Andy's idea to return values as label whenever possible
      eg, 1.2e6 -> 1200000
  but left it commented out

- avoid buffer overflow in ISstream::read(word&).
  Is the 'if (fail())' check itself actually in the correct place??

- other minor cosmetic changes

- since atof is just a call to strtod (in glibc at least), revert to the
  original character collection, convert the number via strtod/strtol and
  check the end pointer so see if everything was converted. Flag both bad
  formats (eg, ".e") and trailing junk (eg, "1.e4e") as a tokenize error.
  These were previously silently ignored.

- simple (same weight as before), but with trivial error checking.
  Retain buffer overflow check.

- allow construct with Xfer container for the addressing

- Replaced non-const addressing() method in BiIndirectList with
  resetAddressing() method as per IndirectList

- only ignore html files in the main directory, not everywhere.
  This is how we lost FoamFooter.html, FoamHeader.html in doc/Doxygen/ in
  the 1.6.x release