4987 - support `browse_trace` tool in SubX

I've extracted it into a separate binary, independent of my Mu prototype.

I also cleaned up my tracing layer to be a little nicer. Major improvements:

- Realized that incremental tracing really ought to be the default.
  And to minimize printing traces to screen.

- Finally figured out how to combine layers and call stack frames in a
  single dimension of depth. The answer: optimize for the experience of
  `browse_trace`. Instructions occupy a range of depths based on their call
  stack frame, and minor details of an instruction lie one level deeper
  in each case.

Other than that, I spent some time adjusting levels everywhere to make
`browse_trace` useful.

1 files changed, 2 insertions, 2 deletions

diff --git a/subx/drun b/subx/drun
index 82584772..15c7f747 100755
--- a/subx/drun
+++ b/subx/drun
@@ -12,9 +12,9 @@ fi
 
 if [[ $1 == 'ex'* ]]
 then
-  CFLAGS=-g ./subx --map --trace run examples/$* 2>x
+  CFLAGS=-g ./subx --map --trace run examples/$*
   exit $?
 fi
 
-CFLAGS=-g ./subx --map --trace run apps/$* 2>x
+CFLAGS=-g ./subx --map --trace run apps/$*
 exit $?