Fix security flaw related to grid filters

Also re-enable warning logging
Extend file upload example
Fix sorting by association

Records with no association set, were not shown.
Thanks Arman "arman000" Bostani.
Support locked columns

Conflicts:
	lib/netzke/basepack/grid/javascripts/grid.js
Fix for the inability to turn off the filters

corrected again!
Add Grid::FiltersOff test cmp
fix disabled pagination
Make fieldname matching transformation in JS the same as in ruby. Also add matching for association fields.
remove debugging lines