Ditz issue update
Add nonportable tags to API calls with I/O
Merge branch 'nonportable-api-tags'

Add "nonportable" tags to API calls which involve non-portable file I/O.
Add floating tags to API documentation

The tags are clickable, so it's easy for a user to find other functions
with the same tag.
Merge branch 'api-call-show-tags'

Add floating tag links to API function call documentation.  The tags are
clickable, so that a user can find functions with the same tag easily.
Ditz issue update
Cleanup, remove unused code from duk_cmdline
Merge branch 'duk-cmdline-cleanups'
Guide threading documentation

Refers to internal document for details.
Initial internal threading documentation

Quite sparse, but should address some common questions.
Merge branch 'improve-threading-docs'

Add a Threading section to the guide, and refer to internal threading
documentation for details.
Ditz issue update