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

etc/config.sh/compiler

@@ -31,7 +31,7 @@
 #------------------------------------------------------------------------------
 
 case "$WM_COMPILER_TYPE" in
-OpenFOAM | ThirdParty)
+ThirdParty)
     # Default versions of GMP, MPFR and MPC, override as necessary
     gmp_version=gmp-system
     mpfr_version=mpfr-system
@@ -88,20 +88,6 @@ Please check your settings
 UNKNOWN_COMPILER
         ;;
     esac
-    WM_COMPILER_TYPE=ThirdParty # Canonical name
-    ;;
-esac
-
-# Common settings (system or ThirdParty)
-case "$WM_COMPILER" in
-Clang*)
-    # Using clang - not gcc
-    export WM_CC='clang'
-    export WM_CXX='clang++'
-    ;;
-Icc*)
-    export WM_CC='icc'
-    export WM_CXX='icpc'
     ;;
 esac