ENH: minor improvements to environment

- handle sourcing bashrc with a relative path (issue #383)
- handle sourcing from bash and zsh.
  Still need manual intervention when sourcing dash, sh, or ksh.
- replace grep in etc/cshrc with sed only
- logical instead of physical path for WM_PROJECT_DIR (issue #431).
  Doesn't seem to be possible for csh/tcsh.

  * Continue using physical locations when comparing directories,
    but not for the top-level FOAM_INST_DIR, WM_PROJECT_DIR.

- relocate WM_CC, WM_CXX overrides from etc/config.*/compiler
  to etc/config.*/settings to ensure that they are left untouched
  when etc/config.sh/compiler is sourced while making third-party
  packages (eg, gcc, llvm, CGAL).

- provide fallback FOAM_TUTORIALS setting in RunFunctions

STYLE: remove "~OpenFOAM" fallback as being too rare, non-obvious

bin/tools/RunFunctions

@@ -28,6 +28,12 @@
 #     Miscellaneous functions for running tutorial cases
 #------------------------------------------------------------------------------
 
+# The normal locations
+[ -n "$FOAM_TUTORIALS" ] || export FOAM_TUTORIALS=$WM_PROJECT_DIR/tutorials
+
+
+#------------------------------------------------------------------------------
+
 #
 # Look for '-parallel' in the argument list.
 #