[PATCH] treat curly-brackets as delimiter

[Nala Ginrut]

According to previous discussion about Sweet _expression_, we should treat curly-brackets as delimiter, say:

{+ 1 1} ==> 2

This patch added an option to read-option to enable this. And the patch will cause Guile treats curly-brackets as delimiter in default. 

We don't see any harm for this till now. But one may disable it with read-option as will.

Regards.

0001-add-SCM_CURLY_BRACKETS_P.patch
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0002-treat-curly-brackets-as-delimiter-in-default.patch
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