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/usertime

@@ -5,7 +5,7 @@ SYNOPSIS
     usertime()
 
 TYPES
-    return	nonnegative real
+    return      nonnegative real
 
 DESCRIPTION
     In POSIX based systems, this function will return the CPU seconds
@@ -23,7 +23,7 @@ EXAMPLE
     ; t = usertime();
     ; x = ptest(2^4253-1);
     ; usertime() - t;
-	1.287804
+        1.287804
 
 LIMITS
     On non-POSIX based systems, this function always returns 0.
@@ -42,7 +42,7 @@ 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
@@ -50,8 +50,8 @@ 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:	2006/12/16 10:31:08
-## File existed as early as:	2006
+## Under source code control:   2006/12/16 10:31:08
+## File existed as early as:    2006
 ##
-## 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/