help() fixed up so it's internalised

A few people pointed out that help() can cause problems, specifically
when the help string is really big, so I've internalised it and injected
my own help() function into the interpreter which pages the output, but
it's pretty ghetto so I'm open to suggestions for improvement.

That said, it's pretty obvious that scrolling up and down (like less)
would be the main requested improvement so I should get to work on that
at some point.

bpython.py

@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-# bpython 0.4.2::fancy curses interface to the Python repl::Bob Farrell 2008
+# bpython 0.5.0::fancy curses interface to the Python repl::Bob Farrell 2008
 #
 # The MIT License
 # 
@@ -64,11 +64,20 @@ try:
 except ImportError:
     OPTS.argspec = False
 else:
-    import pydoc
     OPTS.argspec = True
 
+import pydoc
+
 # TODO:
 #
+# 
+# No config file yet. This will allow things like "indent depth" for requiring
+# the user to hit return n times to signify the end of a code block.
+#
+# C-l doesn't repaint the screen yet.
+#
+# Tab completion does not work if not at the end of the line.
+#
 # Triple-quoted strings over multiple lines are not colourised correctly.
 #
 # Numerous optimisations can be made but it seems to do all the lookup stuff
@@ -719,6 +728,13 @@ class Repl( object ):
                 self.push( line )
             self.push( '\n' )
 
+# The regular help() function uses PAGER to display the help, which
+# screws with bpython.
+        from bpython import internal
+        internal.window = self.scr
+        self.push('from bpython import internal\n')
+        self.push('help = internal._help')
+
         self.iy, self.ix = self.scr.getyx()
         more = False
         while not self.do_exit: