Strange behevior related to include statement. No Include class yet in nclock_statement.py

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Hi pearu,
I looked into r40. It works OK.But two point if you can modify.

1. When I parsed a code, I can not find the include statement.
It seems that there is no class for the include statement.
I think the include statement should make depth one-rank deeper
(as an attribute of the "Include" Class, included file name. 
 Maybe relative path from the source is good from 
 the view of protability).
---Now we see strange results; span gives a line number in the included file. 

2.Then I found that the include statement in a fortran code is automatically
  classified to a comment. I think this is wrong procedure.
  It makes difficult to use fparser as a rewriter.
  If you introduce a class for include, then its instance 
  of included file is just empty, and no content.

So two problems above is systematically solved by adding a "Include" Class
in block_statement.py, I think

Original issue reported on code.google.com by [email protected] on 27 Mar 2010 at 11:36