Remove all PGP modules.

Fixes #182.

Reasoning for the change was:

I think we are just lying to ourselves when we keep PGP module in the
repository.

1. It is not used. Over a year, there is ``DeprecationWarning`` asking
   anybody who uses the module to contact me. Nobody ever did. Even the
   previous maintainer of M2Crypto [did not know how to use
   it](https://stackoverflow.com/a/1042139/164233), and that was 2009.
   Whole Stack Overflow is full of vague comments like “hopefully
   M2Crypto.PGP will help you”, but I have not found on DuckDuckGo one
   example of use of M2Crypto.PGP

2. The main point of M2Crypto is to be Python bindings for OpenSSL. And
   truly most of the other M2Crypto code is just a tiny wrapper around
   C functions. That is not so with M2Crypto.PGP. It is basically
   reimplementation of PGP keys manipulation functions with Python with
   rather large set of Python objects and complicated computations. There
   are very few calls to any C code at all and most work is done by series
   of Python functions. And, obviously, PGP != OpenSSL.

3. There is very tiny test suite for M2Crypto.PGP. It is basically just
   running ``PGP.load_pubring()``, which does exercise a lot of the
   module, but certainly it is far from the rigorous unit testing.

4. And of course, it is completely broken under Python 3, and I have no
   idea how to fix it (especially given 1. I don't want to spend too
   much time on it).

10 files changed, 0 insertions, 52 deletions

diff --git a/doc/M2Crypto.PGP.rst b/doc/M2Crypto.PGP.rst
deleted file mode 100644
index 5396b5d..0000000
--- a/doc/M2Crypto.PGP.rst
+++ /dev/null
@@ -1,51 +0,0 @@
-PGP Package
-===========
-
-:mod:`PGP` Package
-------------------
-
-.. automodule:: M2Crypto.PGP
-    :members:
-    :undoc-members:
-    :show-inheritance:
-
-:mod:`PublicKey` Module
------------------------
-
-.. automodule:: M2Crypto.PGP.PublicKey
-    :members:
-    :undoc-members:
-    :show-inheritance:
-
-:mod:`PublicKeyRing` Module
----------------------------
-
-.. automodule:: M2Crypto.PGP.PublicKeyRing
-    :members:
-    :undoc-members:
-    :show-inheritance:
-
-:mod:`RSA` Module
------------------
-
-.. automodule:: M2Crypto.PGP.RSA
-    :members:
-    :undoc-members:
-    :show-inheritance:
-
-:mod:`constants` Module
------------------------
-
-.. automodule:: M2Crypto.PGP.constants
-    :members:
-    :undoc-members:
-    :show-inheritance:
-
-:mod:`packet` Module
---------------------
-
-.. automodule:: M2Crypto.PGP.packet
-    :members:
-    :undoc-members:
-    :show-inheritance:
-
diff --git a/doc/M2Crypto.rst b/doc/M2Crypto.rst
index 31a03ad..dc6c706 100644
--- a/doc/M2Crypto.rst
+++ b/doc/M2Crypto.rst
@@ -214,6 +214,5 @@ Subpackages
 
 .. toctree::
 
-    M2Crypto.PGP
     M2Crypto.SSL
 
diff --git a/doc/doctrees/M2Crypto.SSL.doctree b/doc/doctrees/M2Crypto.SSL.doctree
index 3ccda5f..c613ca6 100644
--- a/doc/doctrees/M2Crypto.SSL.doctree
+++ b/doc/doctrees/M2Crypto.SSL.doctree
diff --git a/doc/doctrees/M2Crypto.doctree b/doc/doctrees/M2Crypto.doctree
index 73f49b8..b195fd4 100644
--- a/doc/doctrees/M2Crypto.doctree
+++ b/doc/doctrees/M2Crypto.doctree
diff --git a/doc/doctrees/ZServerSSL-HOWTO.doctree b/doc/doctrees/ZServerSSL-HOWTO.doctree
index 3c2a9fc..a807552 100644
--- a/doc/doctrees/ZServerSSL-HOWTO.doctree
+++ b/doc/doctrees/ZServerSSL-HOWTO.doctree
diff --git a/doc/doctrees/environment.pickle b/doc/doctrees/environment.pickle
index d4e74d6..0068ff7 100644
--- a/doc/doctrees/environment.pickle
+++ b/doc/doctrees/environment.pickle
diff --git a/doc/doctrees/howto.ca.doctree b/doc/doctrees/howto.ca.doctree
index 124cf99..25d7aae 100644
--- a/doc/doctrees/howto.ca.doctree
+++ b/doc/doctrees/howto.ca.doctree
diff --git a/doc/doctrees/howto.smime.doctree b/doc/doctrees/howto.smime.doctree
index 3329844..dde291f 100644
--- a/doc/doctrees/howto.smime.doctree
+++ b/doc/doctrees/howto.smime.doctree
diff --git a/doc/doctrees/howto.ssl.doctree b/doc/doctrees/howto.ssl.doctree
index 438b79b..6032ac5 100644
--- a/doc/doctrees/howto.ssl.doctree
+++ b/doc/doctrees/howto.ssl.doctree
diff --git a/doc/doctrees/index.doctree b/doc/doctrees/index.doctree
index 281514e..ddb7340 100644
--- a/doc/doctrees/index.doctree
+++ b/doc/doctrees/index.doctree