Improved the documentation for Foreign Structure Types to more clearly
describe the behavior of mem-aref under the new structure reference
syntax and the compatibility of the bare structure reference with the
old behavior.

New function mem-aptr will return the pointer to the requested element
of the array, and add documentation.  It is untested.

Add definition of C functions prodsumpair and doublepairdouble that
take, and for the latter, return, the structure struct-pair+double
(struct_pair_double) that has a structure struct-pair (struct_pair) in
its slot 'pr.  Two tests, fsbv.3 and fsbv.4, have been defined, and
pass.  Fixed argument to libffi-type-pointer call in
libffi-type-pointer :around method so that these will work.

Documentation for structure conversion; push :fsbv onto features,
export macro translation-forms-for-class.

The default free-translated-object for foreign structures.  The code
for translating a structure with aggregate slots was wrong, because it
did not recognize an existing translator (e.g. complex), so it has
been removed.  Description in manual for defcfun and foreign-funcall
include structure-by-value call specification and requirements.

Patch courtesy of Greg Pfeil. Closes lp:622272.

RELOAD-FOREIGN-LIBRARIES &KEY (TEST #'FOREIGN-LIBRARY-LOADED-P)

Useful especially when saving an image to reload libraries when the
image is re-started.
Pushing #'CFFI:RELOAD-FOREIGN-LIBRARIES to the implementation's
*INIT-HOOKS*(or equivalent) should suffice for most cases

* add a PRINT-OBJECT method for foreign libraries
* signal FOREIGN-LIBRARY-UNDEFINED-ERROR instead of a SIMPLE-ERROR in
  LOAD-FOREIGN-LIBRARY
* keep around the library name used for opening, add reader
  FOREIGN-LIBRARY-NAME

- Added .gitignore.
- Adapted release.sh script to git.
- Removed :version from cffi.asd. Release tarballs now get the release
  version inserted into the tarball's cffi.asd.
- Update manual with git info.

- Add WITH-FOREIGN-OBJECTS and WITH-FOREIGN-STRINGS to the
  dictionary menus. (This unfortunately seems to require
  specifying the @node declarations in full.)
- Make the table of contents more manageable by turning
  @unnumberedsecs into @headings.
- Fix docstring in DEFSTRUCT example.

DEFCFUN & co. now take only :CONVENTION.

Reported by Tobias Rautenkranz.

- Fixed one of the foreign-funcall-pointer examples.
- Improved the defcallback description.

Reported by Naveen Garg.

- use a roman font for comments in the TeX outputs.
- fix some typos and missing @lispcmt{}s.
- insert page breaks before each CLHS-style documentation node.
  This should make it much clearer to read and browse, at the
  expense 23 more pages in total, a ~25% increase.

- Add new example using an argless function.
- Document the docstring support and exemplify it.
- Fix some typos.

Bug reports courtesy of James A. Crippen.

If DEFINE-CONSTANTS is non-null, the enum members will also be defined
as constants.

If a constant's name is a keyword, change it to a symbol
interned in the current package.

Reported by Stelian Ionescu.