Hide mime options that cannot be selected in certain dialogs
Allow selecting where to log to via "logger" preference and add stdout as a recognized option.
Add support for sending the browser to MAFF when appropriate, allowing more featureful MAFF saving.
Add option to only save non-frame documents when in autoshelve mode, especially useful for MAFF output.
Merge branch 'dump_logger' of https://github.com/crass/shelve
Merge branch 'better_maff_support' of https://github.com/crass/shelve
Merge branch 'noframes_autoshelve' of https://github.com/crass/shelve
shelveUtils.debug: log_level was ignored
extensions.shelve.logger defaults to "none"
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