Added faq about boost.python

docs/docs/faq.xml

@@ -50,6 +50,33 @@ cmake --build . --config Release
 
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+      <question text="Why won't the Python bindings compile/work?">
+         To compile dlib's Python bindings you need a correctly installed copy of Boost.Python.  
+         If you are getting errors either during compile time or when you try to import dlib
+         then it is <b>very likely</b> that you have installed Boost.Python incorrectly.
+         <p>
+            <b>It is critical that the copy of Boost.Python you are using is compiled against the specific
+            version of the Python interpreter you are trying to use.</b>  If this is not the case then it won't work.
+            Here are some reasons why you might not have a correct install of Boost.Python
+            <ul>
+               <li>You downloaded Boost.Python binaries from the internet and
+                  they aren't build for whatever Python you are using.  The fix
+                  for this is to either find the correct Boost.Python binaries
+                  or build Boost.Python yourself.</li>
+               <li>You have more than one copy of Python installed on your computer.  The build scripts will try to use
+               whatever python is in your path when you build.  So you need to be consistent about what python interpreter you are using.
+               Everything, both dlib and boost, need to be compiled against the specific Python interpreter you want to use. The simplest thing to do is to 
+               delete other Python interpreters from your machine so there is no confusion.
+               </li>
+            </ul>
+            Other problems users have reported are compiler errors related to X11.  This is pretty much always
+            caused by Anaconda, which includes broken X11 headers in its distribution.  Delete Anaconda if you have
+            this problem.
+         </p>
+      </question>
+
+      <!-- ****************************************** -->
+
       <question text="Why is dlib slow?">
          Dlib isn't slow.  I get this question many times a week and 95% of the time it's from someone
          using Visual Studio who has compiled their program in Debug mode rather than the optimized