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/isblk

@@ -5,30 +5,30 @@ SYNOPSIS
     isblk(val)
 
 TYPES
-    val		any
+    val         any
 
-    return	0, 1, or 2
+    return      0, 1, or 2
 
 DESCRIPTION
     isblk(val) returns 1 if val is an unnamed block, 2 if val is a
     named block, 0 otherwise.
 
     Note that a named block B retains its name after its data block is
-    freed by rmblk(B).	That a named block B has null data block may be
+    freed by rmblk(B).  That a named block B has null data block may be
     tested using sizeof(B);  this returns 0 if and only if the memory
     has been freed.
 
 EXAMPLE
     ; A = blk()
     ; isblk(A)
-	1
+        1
 
     ; B = blk("beta")
     ; isblk(B)
-	2
+        2
 
     ; isblk(3)
-	0
+        0
 
 LIMITS
     none
@@ -51,7 +51,7 @@ 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
@@ -59,8 +59,8 @@ 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:	1997/04/06 03:03:23
-## File existed as early as:	1997
+## Under source code control:   1997/04/06 03:03:23
+## 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/