Followed Wes Hardaker's suggestion to make the translation of
newlines more flexible --- instead of making a boolean for
special translation of blank lines, I added the ability to
specify the translation.
Also added a macro for declaring generic translation keywords
with type information and documentation. Hope this will make
the generic translator easier to use.
Followed Wes Hardaker's idea of permitting alternative rewrites for blank
lines, instead of making the blank line handler be a boolean and
hard-wiring a newline character.
Also added a declaration form, with type and documentation options, for the
keywords used in defining a generic export method.
Added a handler for blockquotes.
Also added :body-newline-paragraph to the org-set-generic-type. This is
intended to help handling output formats (like tikiwiki) where newlines are
treated as paragraph separators, instead of being used to fill (i.e., the
destination is expected to do the word-wrapping). If this is set to T then
org-export-generic will emit a newline character when it sees a blank
line. This should be used in concert with a value like "%s " for
:body-line-format and nil for :body-line-wrap.
