OrderedProperties suffers from clashes between table columns names and its own methods

[Alessandro Molina]

OrderedProperties provides the getattr method which allows to lookup for column information using the dot notation, the issue is that in case my column was actually called like a method of OrderedProperties it returns the method instead of the column.

This is probably not a bug, but it's an unexpected behaviour in most cases. See https://github.com/TurboGears/tg2/issues/64 for origin of this issue.

Probably dot notation access should be deprecated to avoid confusion and only allow dictionary stile access?

[Mike Bayer]

• add a warning suggesting to use the dictionary form of access if the name of the attribute being accessed is non-specific, thereby avoiding collisions on names like items, values, keys. fixes #3475

→ <<cset 6fcc5d4a07e5>>

[Mike Bayer]

• add a warning suggesting to use the dictionary form of access if the name of the attribute being accessed is non-specific, thereby avoiding collisions on names like items, values, keys. fixes #3475

(cherry picked from commit 6fcc5d4a07e5c409a7d8438582598d0e90562ea0)

→ <<cset a0ba7ce055d3>>

[Mike Bayer]

this is the object that does table.c.columname so deprecation would be pretty extreme. getattr() shouldn't be used with this object so a warning is added thanks for reporting!