Merge pull request #46 from giselher/variables-fix

Use getitem magic method instead of getattr
remove redundant backslashes
don't die on =breakpoint-created response

A =breakpoint-created response will be sent by gdbs with the feature
"breakpoint-notifications" when the user adds a breakpoint using the CLI.

Note that the response is NOT handled correctly yet -- the parser just does
not die if it is encountered.
don't use logging in parser which runs in a different thread

Logging, in combination with the handlers we're using, will use widgets to
show the errors. Messing with GUI elements from different threads is not
allowed, however; therefore, this would result in a crash.
STL implementation
Added picture
fixed dynamic path
Add svg datagraph routines
actions: add svg adding connection
Add needed imports
Add initial diagram plugin
Add SVGImage class
Add svg drawing library
added classes for svg drawing
fix crash when using svg images
move SVGImage out of the plugin
read & insert svg file content
pep8 fixes
svg content already has svg tags
fix wrongly named wrapper