DSSP: Fix ValueError: too many values to unpack in __main__

Commit 3e287df caused a minor issue since __iter__ and keys methods of DSSP class return different tuples. DSSP objects cannot be indexed by tuples returned by __iter__. 

Either [d[x][1] for x in d.keys()] or [x[1] for x in d] must be used to get the secondary structure.
Now tested under PyPy 2.2 as well
Bio/PDB/NACCESS: Various NACCESS fixes and unit tests

- os.system(cp/rm) calls converted to correspoding shutils calls.
- os.popen3 and mktemp calls are replaced with subprocess and mkstemp.
- pdb file path is converted to absolute path.
- rsa and asa files added to Tests/PDB directory.
- NACCESS unit tests added.
- NACCESS.py pep8-ified.
Thank Gokcen Eraslan in NEWS and CONTRIB (PDB related work)
Slightly clearer exception for debugging.

This is known to fail on (very old) EMBOSS 2.10.0 output, see:
http://www.biostars.org/p/87226/
Reduce text on NCBI legacy BLAST in Tutorial
1.63 version bump
NEWS update for 1.63
removed (temporarly) the tests for field ti on TogoWS
Python 3 fix for Bio.Restriction update script.

Nowhere else in Biopython uses FancyURLopener so it isn't
currently defined in Bio._py3k (but could be added there).
Update Bio.Restriction update for removal of its DNAUtils module

This also appears to fix a bug in detection of palindromic
sequences (old code wrongly was using object comparison),
which appears to have led to overly verbose regex patterns.
Fix dict whitespace when regenerate Bio/Restriction/Restriction_Dictionary.py

(The previously generated file was edited with a PEP8 tool)
REBASE now uses period (dot) and hypens in Enzyme names. Nasty.
Update to REBASE December 2013 release (and simplify palindromic regex).

Note that the FTP site based update is broken, this was done
by manually downloading the three EMBOSS format files from
http://rebase.neb.com/rebase/rebase.f37.html

The less efficient regex for palindromic digest sites was down to
a bug in how the Seq object comparison was done.
Mention Bio.Restriction REBASE update in NEWS
Clarify last night's comment about getting REBASE files
Add backward compatibility check for TogoWS pubmed 'ti' field (issue #264)
TogoWS pubmed ti --> title
Merge branch 'master' of github.com:biopython/biopython
Merge Bio/Restriction/_Update/Update.py into Scripts/Restriction/rebase_update.py