Remove obsolete documentation texts.

Those are so insanely obsolete, it hurts our eyes.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@21568 57a11ea4-9604-0410-9ed3-97b8803252fd

doc/Makefile.am

@@ -22,7 +22,6 @@ tips_DATA = tip_of_the_day.list
 
 EXTRA_DIST = \
   ${doc_DATA} \
-  misc-notes.txt \
   README.build-system \
   README.HBCI \
   README.OFX \
@@ -30,10 +29,9 @@ EXTRA_DIST = \
   TRANSLATION_HOWTO \
   build-aix.txt \
   build-solaris.txt \
-  generic_objects.txt \
-  gnome-hackers.txt \
   gnucash.1.in \
   gtkrc-2.0.gnucash \
+  misc-notes.txt \
   tip_of_the_day.list.in
 
 ## We borrow guile's convention and use @-...-@ as the substitution

doc/generic_objects.txt

@@ -1,14 +0,0 @@
-This document attempts to summerize discussion on gnucash-devel about
-generic objects in the engine.  This discussion took place between
-2001-11-17 and ... (in case you want to find the archives) and the
-subject was "GncBusiness v. GNCSession".
-
-One part of the problem, explained:
-
-> > That is the whole point.  The problem is that there is no generic
-> > hooks into the GNCSession to store the GNCEntityTable for each
-> > object-type; there is no hook in the GNCBook to store the object
-> > tables (list of existing Customers, Vendors, Invoices, etc); there
-> > is no hook in the Backend structure to load or save these objects;
-> > there is no hook in the Query structure to search these objects.
-

doc/gnome-hackers.txt

@@ -1,34 +0,0 @@
--*-text-*-
-
-This file is intended to contain information for those interested in
-working on the GNOME bits of GnuCash.
-
-Memory Management (care with reference counting):
--------------------------------------------------
-
-I was unsure about when you're supposed to _unref widgets, etc., and
-getting this right is critical to avoiding memory leaks on the one
-hand and dangling pointers on the other.  So I asked on the gtk list,
-and here was the result:
-
-On 16 Aug 1999, Rob Browning wrote:
-> 
-> I've been poking around the gtk web site and in the docs for
-> information on when you're supposed to call gtk_widget_unref.  I want
-> to make sure I'm handling this right so I don't introduce memory
-> leaks, but so far I haven't found anything describing the rules.
-> Actually I'd like to know what the guidelines are for all the *_unref
-> functions...
-> 
-
-Read gtk+/docs/refcounting.txt (or something like that).
-
-Also I think some babble about object finalization at
-http://pobox.com/~hp/gnome-app-devel.html (follow link to sample
-chapters) might be helpful.
-
-Basically you have to unref a widget you never use, but if you put it
-in a container the container "assumes" the initial refcount of 1 and
-the widget will be deleted along with the container.
-
-Havoc