Deleted unnecessary variable

before:
        iso_format = iso_format = {'_data-w2p_datetime_format' : '%Y-%m-%d %H:%M:%S'}

now:
        iso_format = {'_data-w2p_datetime_format' : '%Y-%m-%d %H:%M:%S'}
allow arbistrary params to formstyle=style(placeholder=True, errors='down'), thanks André Kablu
Added an optional render argument to as_trees that if true causes it to render the rows before building the tree
Fixed a bug where as_list was setting the compact value for the rows permanently instead of only temporarily while processing the rows.
Added fix - you cannot concatenate lists with tuples and sets and it was possible that this would happen
minor
Merge branch 'master' of git://github.com/web2py/web2py

Conflicts:
	applications/admin/languages/pt.py
	gluon/dal.py
Merge pull request #473 from omartrinidad/master

Deleted unnecessary variable
Merge pull request #474 from leonelcamara/master

Added an optional render argument to as_trees that if True causes it to ...
Changed a condition in order to not show `None` if there is not error
task dependencies, a little bit of refactoring
Merge pull request #477 from niphlod/enhancement/scheduler_deps

new feature (task dependencies) and a little bit of refactoring
Option to limit inline display of linked tables

Added a new option to smartgrid: "max_linked_inline".
When set to a value greater than zero, it will limit the inline display of linked tables (in grid, edit and details).
In case there are a number of linked tables greater than the setting, the links will be displayed in a select list menu.
Merge pull request #475 from omartrinidad/master

Changed a condition in order to not show `None` if there is no errors
Merge pull request #478 from alexdba/master

Option to limit inline display of linked tables
not sure what happened but fixing local commit
Merge remote-tracking branch 'origin/master'
merging latest online fixes after local brach fix
Fixed issue 1954, re-raising exceptions the right way, thanks Marton
Fixed issue 1962, postgres INSERT ... RETURING id, thanks perakojotgenije