[Pydev-code] Variables checked in

[Aleks T. <a...@to...>]

I've just checked in the variable display for the debugger. It 
was a lot of detail work, merging the way Eclipse & python think.

Final architecture is fairly simple.

 From Eclipse's point of view, variables are arranged 
hierarchically, with each variable belonging to a stack frame, or 
another variable. The variables come in two flavors, simple & 
container. The content of containers is obtained dynamically over 
the network with GetVariablesCommand.

The debugger responds to GetVariableCommand by creating an 
dictionary of variable contents, and returning this dictionary to 
Eclipse. Right now, I know how to build dictionary for 
dictionaries, objects & tuples. Unimplemented container objects 
will get plea for volunteers to implement them. It is pretty 
simple, and involves subsclassing Resolver class in pydevd_vars.

Current areas for improvement are:
- implementing unimplemented container variables
- smarter refresh when stepping. Right now, the variable 
hierarchy closes after every step.

I've also checked in minor tweaks to the editor.

I hope to implement breakpoints by the end of the week, and then 
I am ready for 0.4. Anything you'd like to check in before the 
next release?

This will probably be my last big feature release. But more on 
that later...

Aleks