#502 code analysis ignore package

[Thomas Anatol da Rocha Woelz]

Would be great if you could put a comment tag on a __init__.py file and all that package would not be code-analised (for instance, a comment like this:
#@PyDevCodeAnalysisIgnorePackage

Right now you can make it ignore file by file with the tag #@PyDevCodeAnalysisIgnore, but if there are many files this option would save a lot of work (not to mention cases you aren't allowed to change those files, like when you are including packages that are not your own in the project).
Another option would be making pydev check for an empty file there named something like PyDevCodeAnalysisIgnore, so all files and subdirectories are ignored by code-analysis.