The Makefiles are now in the makefiles sub-directory

The "-f | -force" option in wmakeLnInclude is now "-u | -update" for
consistency with the other scripts.

The "Usage" entry in the headers is now consistently formatted in all
scripts.

This reverts commit c5bea524.

This reverts commit 2e1e671d.

- adds more DWIM (do what I mean) intelligence to wmake

ENH: use ~/.OpenFOAM/.wmake instead of ~/.wmakeScheduler for the lock dir

- keeps more of the OpenFOAM bits together

- more consistent script names
- remove '-help' option from internal scripts

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

  - send error messages to stderr
  - added -h/-help options where some were missing
  - changed 3-space to 4-space indentation
  - where possible, allow multiple directories from the command-line

  - fixed typo: had skipped '-Make' instead of 'Make' directory

  - remove broken links first
    * helps when file locations have changed

  - filter out trailing 'lnInclude' from the <dir> spec
    * this makes it easier to update existing lnInclude dirs:
         find -name lnInclude -exec wmakeLnInclude -f {} \;

  - reduced output noise when re-creating an identical link