Cleanup: fix names of recipe and patch files.

* this fixes the wrong recipe names introduced by myself in #d525fee
* adjust patch names to match corresponding recipes
* additionally: create 'additional-files' folders as hint to some
  ports that do not have a proper recipe yet

dev-libs/mpfr/mpfr-3.0.0_7047

@@ -1,27 +0,0 @@
-DESCRIPTION="library for multiple-precision floating-point computations with exact rounding" 
-HOMEPAGE="www.mpfr.org" 
-SRC_URI="svn://scm.gforge.inria.fr/svn/mpfr/branches/3.0#7047"
-REVISION="1"
-STATUS_HAIKU="broken"
-DEPEND="dev-libs/gmp = ?.?.?"
-#CHECKSUM_MD5=""
-BUILD()
-{
-	cd mpfr-3.0.0-7047
-	libtoolize --force --copy --install
-	aclocal -I m4
-	automake --add-missing
-	autoconf
-	./configure --prefix=`finddir B_COMMON_DIRECTORY`
-	make
-}
-
-INSTALL()
-{
-	cd mpfr-3.0.0-7047
-	make install
-	make check
-}
-
-LICENSE="GNU LGPL v3"
-#COPYRIGHT=""