allow customization of  default /manage/auth, thanks Anthony
Merge pull request #108 from ilvalle/editor

Editor improvements
better layout.html and web2py_bootstra.css, thanks Paolo
no references in archive tables
fixed Issue 1532:mongodb: why to catch connection exceptions? thanks Alan
fixed Issue 1530:Impersonation events not recorded if redirections onaccept, thanks kmouts
fixed Issue 1522:Trigger for primary key on oracle database
merged some code form issue 1534 Session ID not changed after privilege level change, thanks kablubr
fixed Issue 1538:Update Script setup-web2py-nginx-uwsgi-centos64.sh, thanks jniltinho
more secure sessions, now pass tests, thanks André Kablu
fixed  Issue 1539:user_groups are not updated during and after impersonation, thanks kmouts
added/removed files to hg/git, thanks Lightdot
removed unwanted print statement
no clickable headers for virtual fields, thanks Anthony
removed gql.py and added gae memcache incr
fixed Issue 1541:[REQ] support for dot=T('.') in IS_DECIMAL_IN_RANGE()
reverted new german translation
partial fix for issue 1531, disable validation in crud search
fixed issue 1527 with smartgrid (again), thanks ato.steil
resynced recent patches, sorry for the mess