Now all modules are in core modules folder

modules/geshifilter/README.txt

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+
+============================
+GeSHi Filter (Drupal Module)
+============================
+
+
+DESCRIPTION
+-----------
+The GeShi Filter is a Drupal module for syntax highlighting of pieces of
+source code. It implements a filter that formats and highlights the syntax of
+source code between for example <code>...</code>.
+
+
+DEPENDENCY
+----------
+This module requires the third-party library GeShi 1.0.x (Generic Syntax
+Highlighter, written by Nigel McNie) which can be found at
+  http://qbnz.com/highlighter
+See installation procedure below for more information.
+
+
+INSTALLATION
+------------
+1. Extract the GeSHi Filter module tarball and place the entire geshifilter
+  directory into your Drupal setup (e.g. in sites/all/modules).
+
+2. Download the GeSHi library from
+  http://sourceforge.net/projects/geshi/files/geshi
+  Make sure you download a version of the branch 1.0.x and not a version
+  from the branch 1.1.x (also described as geshi-dev), which is not yet
+  supported by the GeSHi filter module.
+  Place the entire extracted 'geshi' folder (which contains geshi.php)
+  in the geshifilter directory (e.g. as sites/all/modules/geshifilter/geshi),
+  or better, in a libraries directory (e.g. as sites/all/libraries/geshi).
+
+3. Enable this module as any other Drupal module by navigating to
+  administer > site building > modules
+
+
+CONFIGURATION
+-------------
+1. The general GeSHi Filter settings can be found by navigating to:
+  administer > site configuration > geshifilter.
+  Set the path to the GeSHi library on that page, if it is not detected
+  automatically already.
+2. Further configuration instructions can be found by following the
+  "more help..." link at the top of that general settings page, which leads
+  to www.example.com/?q=admin/help/geshifilter . This requires you have the
+  'help' module enabled.
+
+
+USAGE
+-----
+The basic usage (with the default settings) is:
+  <code language="java">
+  for (int i; i<10; ++i) {
+    dothisdothat(i);
+  }
+  </code>
+When language tags are enabled (like "<java>" for Java) you can also do
+  <java>
+  for (int i; i<10; ++i) {
+    dothisdothat(i);
+  }
+  </java>
+More options and tricks can be found in the filter tips of the input format at
+www.example.com/?q=filter/tips .
+
+
+AUTHORS
+-------
+Original module by:
+  Vincent Filby <vfilby at gmail dot com>
+
+Drupal.org hosted version for Drupal 4.7:
+  Vincent Filby <vfilby at gmail dot com>
+  Michael Hutchinson (http://compsoc.dur.ac.uk/~mjh/contact)
+  Damien Pitard <dpdev00 at gmail dot com>
+
+Port to Drupal 5:
+  rötzi (http://drupal.org/user/73064)
+  Stefaan Lippens (http://drupal.org/user/41478)