Fix python block chunking

[ngeiswei]

Partially revert commit 8dda9e4 so that code blocks with newlines in the middle don't get split.

[ngeiswei]

@linas I let it to you to review and possibly merge.

[ngeiswei]

I suggest to merge it. If something is wrong I should be able to fix today.

[linas]

OK, well, additional fixes are needed: at this time, starting the cogserver, telnetting to port 17001, and entering the python shell there produces no output, either at the shell, or at the cogserver, for this:

for i in range(10) :
    print "foo", i

Before your change, the above worked. I am not sure that anyone is acutally using the python shell for anything at this time, so maybe fixing this is low-priority.

[linas]

This is not valid python. When I run this by hand, in python, I get an error:

>>> def fun(x):
...     y = x + 1
... 
>>>     return y
  File "<stdin>", line 1
    return y
    ^
IndentationError: unexpected indent
>>> 

[linas]

However, if I copy the above into a file, and run it from a file i.e. python f.py then it runs without any errors. So it seems that python is inconsistent with itself, as to what it accepts as valid syntax.

Contents of f.py:

def fun(x):
    y = x + 1


    print "foo", y
    return y

fun(1)
print "bar"

[ngeiswei]

Yeah, since opencog python interpreter is supposed to work in non-interactive/script mode as well (as is the case now) we want to support newlines within blocks.