- search for 'lnInclude' rather than 'Make' by default
  This gives better general behaviour for rebuilding.

- similar to the #include directive, but does not generate an error if the
  file does not exist.

Note: opted for an explicit naming #includeIfPresent rather than #cinclude

- Rename to a corresponding backup file
  If the backup file already exists, attempt with "01" .. "99" suffix.

- git ignore indexed backup files too

- update foamPack* scripts accordingly

- skip including java rather than having recursive includes
  (and too many files open error) when WM_JAVAC_OPTION isn't defined.

The Qt version is now checked for >= 4.3.

- as Henry pointed out, they all go into one single table.
  So they'll clash with the correct incompressible versions.

- handle ThirdParty-VERSION properly

- handle wmake/utilbin/ location

- should the wmake/rules/* really be packed with a binary distribution?
  I think this is just left over from before.

- keeps sources in sync for the 1.6 release and it'll get fiddled with
  for the 1.7 release anyhow