[release] Update version to 0.6.pre6.

Also: minor cleanup of 'native-code' report.

INSTALL.txt

@@ -12,8 +12,8 @@ Quick Start
 
 If you haven't already done so, extract the tarball:
 
-    tar -x --xz < oil-0.6.pre5.tar.xz
-    cd oil-0.6.pre5
+    tar -x --xz < oil-0.6.pre6.tar.xz
+    cd oil-0.6.pre6
 
 Either install as /usr/local/bin/osh:
 
@@ -31,7 +31,7 @@ The latter doesn't require root access, but it requires ~/bin to be in your
 PATH.
 
 NOTE: Out-of-tree builds are NOT currently supported, so you have to be in the
-oil-0.6.pre5 directory.
+oil-0.6.pre6 directory.
 
 Smoke Test
 ----------

benchmarks/native-code.R

@@ -24,7 +24,7 @@ options(stringsAsFactors = F,
 # frame: A table with 3 columns.  ctx$symbols or ctx$compileunits.
 Basic = function(frame) {
   frame %>% arrange(desc(filesize)) %>% head(20) -> f1
-  ShowValue('Number of Symbols: %d', nrow(frame))
+  ShowValue('Rows: %d', nrow(frame))
 
   frame %>% arrange(desc(filesize)) %>% head(20) -> f1
   ShowFrame('By Size On Disk:', f1)
@@ -50,10 +50,9 @@ Report = function(ctx) {
   # This isn't foolproof, but docstrings seem to be named with a _doc or
   # __doc__ suffix.
   ctx$symbols %>% filter(str_detect(symbols, '_doc(__)?')) -> f3
-  ShowFrame('Doc', f3 %>% head(20))
+  ShowFrame('Big Docstrings (approximate, based on name)', f3 %>% head(20))
 
-  ShowValue('Approx number of docstrings: %d in %d bytes', nrow(f3),
-            sum(f3$filesize))
+  ShowValue('%d symbols in %d bytes', nrow(f3), sum(f3$filesize))
 }
 
 Load = function(in_dir) {

doc/osh-quick-ref-toc.txt

@@ -2,7 +2,7 @@ OSH Quick Reference
 
 - Below is a list of topics, organized into [Sections].
 - The X prefix means "unimplemented".  Oil features are all unimplemented!
-- HTML version: https://www.oilshell.org/release/0.6.pre5/doc/osh-quick-ref.html
+- HTML version: https://www.oilshell.org/release/0.6.pre6/doc/osh-quick-ref.html
 
 INTRO
   [Overview]      overview   osh-vs-oil   command-vs-expr

doc/release-index.md

@@ -1,6 +1,6 @@
 <!-- NOTE: This file is at /release/$VERSION/index.html -->
 
-Oil Version 0.6.pre5
+Oil Version 0.6.pre6
 -----------------
 
 ### What's New

oil-version.txt

@@ -1,4 +1,4 @@
-0.6.pre5
+0.6.pre6
 
 # The first line of this file is the Oil version, and the rest is ignored.
 # It's used at build time for the release tarball, and at runtime for oil