pbkdf2 implemented ctypes wrapper around OpenSSL native implementation: 6x speedup
better autocomplete in web2pu shell
fixed problem with alias and record versioning
pbkdf2_ctypes updated from upstream
Merge pull request #148 from michele-comitini/pbkdf2_ctypes

[READ BEFORE APPLYING] pbkdf2 implemented ctypes wrapper around OpenSSL native implementation.
Merge ssh://github.com/web2py/web2py