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