CONFIG: relocate WM_PROJECT definition in bashrc, cshrc

- locate where the user is less tempted to change it (#1515).
  It really should be considered an invariant environment variable.

STYLE: wmake -help information to stdout, die errors to stderr

etc/bashrc

@@ -39,11 +39,12 @@
 #         - local site-specific directory, uses WM_PROJECT_DIR/site if unset
 #
 # Note
-#     Changes made to this bashrc file may be lost with the next upgrade.
+#     Changes made to this file will be lost with the next upgrade.
 #
 #------------------------------------------------------------------------------
 
-export WM_PROJECT=OpenFOAM
+# [WM_PROJECT_VERSION] - A human-readable version name
+# A development version is often named 'com' - as in www.openfoam.com
 export WM_PROJECT_VERSION=com
 
 #------------------------------------------------------------------------------
@@ -67,7 +68,7 @@ export WM_PRECISION_OPTION=DP
 # = 32 | 64
 export WM_LABEL_SIZE=32
 
-# [WM_COMPILE_OPTION] - Optimised, debug, profiling, other:
+# [WM_COMPILE_OPTION] - Optimised(default), debug, profiling, other:
 # = Opt | Debug | Prof
 # Other is processor or packaging specific (eg, OptKNL)
 export WM_COMPILE_OPTION=Opt
@@ -82,6 +83,9 @@ export WM_MPLIB=SYSTEMOPENMPI
 #------------------------------------------------------------------------------
 # (advanced / legacy)
 
+# [WM_PROJECT] - This project is "OpenFOAM" - do not change
+export WM_PROJECT=OpenFOAM
+
 # [projectDir] - directory containing this OpenFOAM version.
 # \- When this file is located as $WM_PROJECT_DIR/etc/bashrc, the next lines
 #    should work when sourced by BASH or ZSH shells. If this however fails,