Changes for version 19.v19

This version introduces support for delimiters other than round
brackets.  Previously, if the major mode's syntax table considered
square brackets (and curly braces, &c.) to be delimiters, since no
paredit commands would insert them balanced, deleting them would be
tricky: paredit's DEL & C-d bindings would refuse to delete them
because they would be imbalanced unless you manually type the closing
delimiter.

Now commands are defined for the opening and closing of parentheses
(round), brackets (square), braces (curly), and brockets (angled),
named `paredit-open-<type>', `paredit-close-<type>-and-newline', and
`paredit-close-<type>'; paredit-mode binds the opening and closing
square bracket keys to be `paredit-open-bracket' and `paredit-close-
bracket', respectively.  The rest you can bind yourself; this minimal
pair of bindings will, I think, account for accidental insertion,
elisp vectors, and (bletch) the equation of square and round brackets
as parentheses in some non-standard Scheme extensions.

Also now supported in this version is insertion of delimiter pairs
around active regions in transient-mark-mode.  If you mark a region
with transient-mark-mode enabled, you can use any of the delimiter
pair insertion keys (like opening round bracket, double-quote, &c.)
to insert a pair of delimiters around the region.  There are now two
ways to parenthesize lists of expressions with visual feedback: using
M-( (paredit-wrap-sexp) followed by C-) (paredit-forward-slurp-sexp)
until satisfied, and now C-M-SPC (mark-sexp) until you have marked
the desired expressions and then any of the delimiter pair insertion
keys to insert the delimiters.

darcs-hash:20080928134228-00fcc-3ec209344dbaea07e93f2e02cddead13f7e39c6a

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