[PATCH] Add a flag to disable all analyzer warnings

[Anna Zaks]

Please, review:

Add an option to silence all analyzer warnings.

People have been incorrectly using "-analyzer-disable-checker" to 
silence analyzer warnings on a file, when analyzing a project. Add 
the "-analyzer-disable-all-checks" option, which would allow to do 
this and suggest it as part of the error message for 
"-analyzer-disable-checker".

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