convert ASCII TABs to ASCII SPACEs

Converted all ASCII tabs to ASCII spaces using a 8 character
tab stop, for all files, except for all Makefiles (plus rpm.mk).
The `git diff -w` reports no changes.

help/sum

@@ -5,9 +5,9 @@ SYNOPSIS
     sum(x_1, x_2, ...)
 
 TYPES
-    x_1, x_2, ...	any
+    x_1, x_2, ...       any
 
-    return		any
+    return              any
 
 DESCRIPTION
     If an argument x_i is a list with elements e_1, e_2, ..., e_n, it
@@ -18,7 +18,7 @@ DESCRIPTION
     xx_sum(x_i) if the function xx_sum() has been defined.  If the
     type xx has been defined by:
 
-		obj xx = {x, y, z},
+                obj xx = {x, y, z},
 
     an appropriate definition of xx_sum(a) is sometimes a.x + a.y + a.z.
     sum(a) then returns the sum of the elements of a.
@@ -66,7 +66,7 @@ SEE ALSO
 ##
 ## Calc is distributed in the hope that it will be useful, but WITHOUT
 ## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
-## or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU Lesser General
+## or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General
 ## Public License for more details.
 ##
 ## A copy of version 2.1 of the GNU Lesser General Public License is
@@ -74,8 +74,8 @@ SEE ALSO
 ## received a copy with calc; if not, write to Free Software Foundation, Inc.
 ## 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 ##
-## Under source code control:	1997/03/10 03:59:59
-## File existed as early as:	1997
+## Under source code control:   1997/03/10 03:59:59
+## File existed as early as:    1997
 ##
-## chongo <was here> /\oo/\	http://www.isthe.com/chongo/
-## Share and enjoy!  :-)	http://www.isthe.com/chongo/tech/comp/calc/
+## chongo <was here> /\oo/\     http://www.isthe.com/chongo/
+## Share and enjoy!  :-)        http://www.isthe.com/chongo/tech/comp/calc/