ENH: add 'subcommand' handling to wmake (#1693)

- initial split of wmake-related commands into "plumbing" and
  "porcelain" akin to how git handles things.

- wmakeBuildInfo (very low-level), now relocated to the wmake/scripts
  and accessible for the user as "wmake -build-info".

  This satisfies a long-standing desire to access build information
  in a fashion similar to the api/patch information.

CONFIG: avoid git information when building with a debian/ directory

- when a 'debian/' directory exists, there is a high probability that
  the '.git/' directory is from debian and not from OpenFOAM (ie,
  useless here). This corresponds to an implicit '-no-git', which has
  no effect when building from pristine sources.

ENH: wmakeCheckPwd becomes scripts/wmake-check-dir

- accessible for the user as "wmake -check-dir" and with 1 or 2
  directory names. A wmakeCheckPwd symlink left for compatibility.

bin/foamEtcFile

@@ -43,9 +43,11 @@
 # Note
 #     This script must exist in the project 'bin' directory
 #
-#     The '-show-api' and '-show-patch' options implement partial logic
-#     from wmake/wmakeBuildInfo.
-#     Make sure that any changes there are also reflected here.
+#     The '-show-api' and '-show-patch' options extract values from
+#     the "META-INFO/api-info" file
+#
+# SeeAlso
+#     META-INFO/README.md for other routines that also use META-INFO.
 #
 #-------------------------------------------------------------------------------
 printHelp() {

bin/tools/foamPackRelease

@@ -264,7 +264,7 @@ patch="$(git --git-dir="$gitbase/.git" show "$sha1" | sed -ne s/patch=//p)"
 
 [ -n "$api" ] || die "Could resolve api value"
 
-# Determine the BUILD information from git, as per wmakeBuildInfo.
+# Determine the BUILD information from git, as per `wmake -build-info`
 build="$(git --git-dir="$gitbase/.git" log -1 --date=short --format='%h=%ad' 2>/dev/null|sed 's/-//g;s/=/-/')"
 
 echo "Detected api, patch, build as '$api', '$patch', '$build'" 1>&2