Replaced lots of tabs with spaces

platforms/reference/tests/TestReferenceEwald.cpp

@@ -90,7 +90,7 @@ void testEwaldExact() {
 //   where 
 //   M            :    Madelung constant (dimensionless, for FCC cells such as NaCl it is 1.7476)
 //   e            :    1.6022 × 10−19 C
-//   4*pi*epsilon0	: 	1.112 × 10−10 C²/(J m)
+//   4*pi*epsilon0:     1.112 × 10−10 C²/(J m)
 //   a0           :    0.282 x 10-9 m (perfect cell)
 // 
 //   E is then the energy per pair of ions, so for our case