some reformatting

Replace some
  (foo &&
   bar)
that had crept back into the code with
  (foo
   && bar)
to match the reformatting which took place before 3.6.0.  There are a
couple of lines ending in '||' still present but they look intentional.
isaac64.c has some trailing '|' bit operators that could/should be
moved to the start of the next line but I didn't touch that file.

While in the affected files, I tried to shorten most overly wide lines
(the right margin is supposed to at column 78 and there are quite a
few lines which are 79 characters long, but I left most of those
rather than introduce new line splits).  Also replace a handful of
tabs with spaces.  I was a little surprised not find any trailing
spaces (in the dozen or so files being updated).  I didn't look for
trailing arithmetic or '?'/':' operators which aught to be moved to
the start of the next line.

src/mklev.c

@@ -82,8 +82,8 @@ door_into_nonjoined(xchar x, xchar y)
             continue;
 
         /* Is this connecting to a room that doesn't want joining? */
-        if (levl[tx][ty].roomno >= ROOMOFFSET &&
-            !g.rooms[levl[tx][ty].roomno - ROOMOFFSET].needjoining) {
+        if (levl[tx][ty].roomno >= ROOMOFFSET
+            && !g.rooms[levl[tx][ty].roomno - ROOMOFFSET].needjoining) {
             return TRUE;
         }
     }
@@ -1610,7 +1610,7 @@ mktrap(int num, int mktrapflags, struct mkroom *croom, coord *tm)
 
 void
 mkstairs(xchar x, xchar y,
-         char up,	/* [why 'char' when usage is boolean?] */
+         char up,       /* [why 'char' when usage is boolean?] */
          struct mkroom *croom UNUSED)
 {
     d_level dest;