check for __memcache_client not __mc_instance
Merge pull request #121 from tinio/memcache-bug

This looks to be a typo left behind from previous code when checking for an __memcache_client
fixed issue 1570:Recent web2py does no longer support table-aliasing, thanks Dominic
fixed issue 1562:The dspval of integer value zero is nbsp not 0, thanks iiijjjiii
fixed problem with admin replacing text, thanks Niphlod
no more collapsible menu if not is_mobile, thanks Paolo
fixed a problem with missing _extra
calendar z-index:2000
fixed  Issue 1572:mongodb contains operator typo, thanks Alan
auth.get_or_create_user(login=False)
rows.repr -> rows.render
fixed typo, thanks Michele
row speedups
uncommented faster code
Merge pull request #123 from michele-comitini/row_speedup3

Row speedup3
speedup in getattr, thanks Michele
appadmin manage patch, thanks Anthony
fixed issue Issue 1549:signature of original link is lost after successful login, thanks Oleb Butovich
fixed problem with web2py.js, thanks Niphlod
auth log messages are not longer translated, thanks Anthony