CONFIG: improve prefix matching for system libraries (#1607)

- missed detection of system libraries when installed with multiarch
  paths like /usr/lib/x86_64-linux-gnu

CONFIG: improve handling of group/user config files (#928)

- changed bashrc handling of FOAM_CONFIG_NOUSER to use
  FOAM_CONFIG_MODE instead. Propagate into foamEtcFile to make this
  a stickier control.

  This change allows better control, but also enables cluster
  installations to define their own value within the OpenFOAM prefs.sh
  file to prevent users accidentally mis-configuring things if
  necessary.

- remove undocumented handling of an (a)ll mode in foamEtcFile to
  avoid potential pitfalls.

- add support for FOAM_CONFIG_ETC handling.
  This allows injection of an extra search layer when finding
  project etc files

ENH: improvements to foamConfigurePaths (#928)

- handle FOAM_CONFIG_ETC implicitly, or explicitly with the new
  -etc option.

STYLE: more explicit wording in foamConfigurePaths usage (#1602)

- document that an absolute path (eg, -scotch-path) overrides/ignores
  the equivalent ThirdParty setting (eg, -scotch)

- longer options -system-compiler and -third-compiler for -system
  and -third, respectively. Clearer as to their purpose.

- adjust the location sanity check to look for META-INFO directory.

bin/foamNewFunctionObject

@@ -7,6 +7,7 @@
 #    \\/     M anipulation  |
 #-------------------------------------------------------------------------------
 #     Copyright (C) 2016-2017 OpenFOAM Foundation
+#     Copyright (C) 2020 OpenCFD Ltd.
 #------------------------------------------------------------------------------
 # License
 #     This file is part of OpenFOAM.
@@ -33,7 +34,7 @@
 #
 #------------------------------------------------------------------------------
 Script=${0##*/}
-DIR="$FOAM_ETC/codeTemplates/functionObject"
+DIR="$WM_PROJECT_DIR/etc/codeTemplates/functionObject"
 
 usage() {
     while [ "$#" -ge 1 ]; do echo "$1"; shift; done