[9front] [FQA] some fixes

[mkf <mkf9@riseup.net>]

Hello.
This patch changes following pages:
page 59, #9front -> #cat-v 
page 126, monospaces refernces to files and ndb configuration
page 160, mention 10/10 is not possible on 9front with mail-tester.com because of no dkim (yet?)
page 201, hg is gone.
page 220, python is gone.

i've also noticed following issues, but not sure about them:
page 83, t430s lacks info
page 184, "read u9fs(4)" 
- since we don't have u9fs man page on 9front anymore, this is misleading.
maybe a link to u9fs man page?


this is first time i'm writing documents using troff, so please
mention if there are errors.
Thanks!

term%  for( i in *.ms) diff -u /n/fqa/$i $i
--- /n/fqa/appendixl.ms
+++ appendixl.ms
@@ -165,7 +165,11 @@
 .html - <br />
 .FG python gif
 
-Python 2.5.1 is included with the 9front distribution, not because anyone loves Python, but because it was required by Mercurial (also loved by no one), which was required by Google Code (shutting down in 2015). An abject lesson in expediency.
+Until git9 imported on 9front, python 2.5.1 was included with the 9front distribution, not because anyone loves Python, but because it was required by Mercurial (also loved by no one), which was required by Google Code (shutting down in 2015). An abject lesson in expediency. You still can install it from
+.ihtml a <a href="http://git.9front.org/plan9front/pyhg/HEAD/info.html">
+http://git.9front.org/plan9front/pyhg/HEAD/info.html
+.ihtml a
 
 Jeff Sickel ported Python 2.7 to Plan 9.
 .html - Download it <a href="https://bitbucket.org/jas/cpython">here</a>.<p>David du Colombier's notes on to install Python (and Mercurial) are available <a href="http://9legacy.org/9legacy/doc/python/notes">here</a>.
--- /n/fqa/fqa2.ms
+++ fqa2.ms
@@ -408,7 +408,7 @@
 .ihtml a
 join
 .CW
-#9front
+#cat-v
 .R
 on
 .CW
--- /n/fqa/fqa6.ms
+++ fqa6.ms
@@ -101,16 +101,25 @@
 pair with attribute file identifies a file to be included in
 the database.  The files are searched in the order they
 appear.  For example:
-
+.P1
      database=
           file=/lib/ndb/common
           file=/lib/ndb/local
           file=/lib/ndb/global
+.P2
 
 declares the database to be composed of the three files
-/lib/ndb/common, /lib/ndb/local, and /lib/ndb/global.  By
-default, /lib/ndb/local is searched before the others.  How-
-ever, /lib/ndb/local may be included in the database to
+.CW/lib/ndb/common,
+.CW /lib/ndb/local, 
+and 
+.CW /lib/ndb/global
+.  By
+default,
+.CW /lib/ndb/local
+ is searched before the others.  How-
+ever, 
+.CW /lib/ndb/local
+ may be included in the database to
 redefine its ordering.
 
 Within tuples, pairs on the same line bind tighter than
--- /n/fqa/fqa7.ms
+++ fqa7.ms
@@ -1782,6 +1782,8 @@
 .html a <a href="https://www.mail-tester.com">
 .CW https://www.mail-tester.com
 .html a
+please note that it's currently not possible to get 10 of 10 
+possible scores on 9front, because of lack of DKIM support.
 
 .html - <a name="7.7.9" />
 .ihtml h2 <h2>
--- /n/fqa/fqa8.ms
+++ fqa8.ms
@@ -2726,11 +2726,11 @@
 .R
 .ihtml h3
 
-9front ships with
+9front used to ship with
 .ihtml a <a href="https://www.mercurial-scm.org">
 Mercurial.
 .ihtml a
-
+not anymore. it has replaced with git9.
 Read:
 .ihtml a <a href="http://fqa.9front.org/fqa5.html#5.2.1.1">
 .I