[O] a couple tangle questions (tangle a single block, comment syntax)

[Alan Schmitt]

Hello,

I'm moving my configuration files to an org file to be tangled, and I
have a couple questions.

First, is there a command to tangle a single block, or blocks in a
subtree?

Second, I like to have the :comments link option in my tangled files (to
reference where they were tangled from), but some files do not have an
emacs mode, so I use a "config" source block. For these files, org does
not know the syntax of comments, so it asks me for it. Can I specify the
syntax for comments in the header of the source block?

Thanks a lot,

Alan

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