Merge ~cjwatson/launchpad:doc-faq into launchpad:master

[Colin Watson]

Add FAQ from dev.launchpad.net

Originally https://dev.launchpad.net/FAQ.

[Jürgen Gmach (jugmac00)]

I am not sure whether these are really frequently asked questions :-), but LGTM!

review: Approve

diff --git a/doc/faq.rst b/doc/faq.rst
 new file mode 100644
index 0000000..5890dd2
--- /dev/null
+++ b/doc/faq.rst
@@ -0,0 +1,60 @@
+==========================
+Frequently Asked Questions
+==========================
+
+Are there Launchpad packages available?
+=======================================
+
+No, Launchpad is not packaged and there are no plans to do so.  Launchpad
+deployment is done straight from Git branches and is quite complex.
+
+Why PostgreSQL?
+===============
+
+PostgreSQL was chosen in 2004 because it supported most of the features we
+thought we would need; MySQL did not.  The other contender was Oracle, and
+for a while we made sure we would be able to switch to Oracle if necessary
+but PostgreSQL has worked great.
+
+How integrated is the database in the code?
+===========================================
+
+Highly. We make use of PostgreSQL specific features, such as:
+
+* SQL language extensions
+* PL/pgSQL and Python stored procedures
+* Triggers
+* Functional indexes
+* Automatic load balancing over the replicas with Slony-I
+* Transactional DDL
+* tsearch2 full text search
+* Database permissions
+
+What version of Python is required?
+===================================
+
+Currently, Python 3.5.
+
+Can I look at the code without downloading it all?
+==================================================
+
+Yes, you can browse the `source code
+<https://git.launchpad.net/launchpad/tree>`_ on Launchpad.  You can also use
+``git clone https://git.launchpad.net/launchpad`` to download the code
+without setting up a development environment.
+
+I have Launchpad running but mails are not sent...
+==================================================
+
+Development Launchpads don't send email to the outside world, for obvious
+reasons.  They connect to the local SMTP server and send to root.  To create
+new users, create a new account, and check the local mailbox, or use
+``utilities/make-lp-user``.
+
+My database permissions keep getting deleted!
+=============================================
+
+If your local account is called "launchpad" it conflicts with a role called
+"launchpad" which is defined in ``database/schema/security.cfg``.  You need
+to rename your local account and re-assign it superuser permissions as the
+``utilities/launchpad-database-setup`` script does.
diff --git a/doc/index.rst b/doc/index.rst
index ff19541..6f42ae4 100644
--- a/doc/index.rst
+++ b/doc/index.rst
@@ -20,6 +20,7 @@ Overview
    strategy
    scope
    values
+   faq
 
 Guides
 ======