ENH: Remove python dl dependency

I removed the dl import in the LibraryLoader class. dl is deprecated since python 2.6.
http://docs.python.org/2/library/dl.html
I also removed the calls to sys.setdlopenflags() which are no more needed.

Change-Id: Iec62c8d51e330cf81b610f5ffee9e8ca4268ad91
ENH: Remove psyco import

Psyco is no more maintained, see http://en.wikipedia.org/wiki/Psyco.
There seem also to be some memory overhead if you use it.
http://stackoverflow.com/questions/575385/why-not-always-use-psyco-for-python-code

Change-Id: I9cb86fedc6d21e3ff890cef57dae57c0b6689f9a
COMP: Update PCRE to 8.34

Change-Id: I8aa62b97ce919e02ce7896e5318ad59f5fd77d1e
Merge topic 'Python-remove-dl-2'

4c3bfad3 ENH: Remove python dl dependency
Merge topic 'PCRE-update'

977c754c COMP: Update PCRE to 8.34
Merge topic 'Remove-psyco'

1986c4e7 ENH: Remove psyco import