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/highbit

@@ -5,13 +5,13 @@ SYNOPSIS
     highbit(x)
 
 TYPES
-    x		nonzero integer
+    x           nonzero integer
 
-    return	integer
+    return      integer
 
 DESCRIPTION
     If x is a nonzero integer, highbit(x) returns the index of the
-    highest bit in the binary representation of abs(x).	 Equivalently,
+    highest bit in the binary representation of abs(x).  Equivalently,
     highbit(x) = n if 2^n <= abs(x) < 2^(n + 1);  the binary
     representation of x then has n + 1 digits.
 
@@ -36,7 +36,7 @@ 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
@@ -44,8 +44,8 @@ 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:	1995/10/03 10:40:02
-## File existed as early as:	1995
+## Under source code control:   1995/10/03 10:40:02
+## File existed as early as:    1995
 ##
-## 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/