[schema,server] add a security debugging aid (closes #2920304)
- Add a DGB_SEC debugging flag (to be used with set_debug/debugged).
- Add a context manager (tunesecurity) to filter security assertions.
Note: this does not address all read-security mecanisms.
\.svn
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.*/data/database/.*\.sqlite
.*/data/database/.*\.config
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^doc/html/
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^doc/book/en/devweb/js_api/