Fix some problems with the User's guide.

doc/user_guide.texi:
	Delete a reference to `:' as a module qualifier.

	Comments in texinfo begin with "@c", not "%".

	Fix an ordering mismatch between the menu and the sectioning:
	``Build options'' and ``Miscellaneous options'' should
	occur *after* ``Link options''.
Fix warnings from texinfo in User's guide.

doc/user_guide.texi:
	Fix spots where there were ordering mismatches between the menus and the
	sectioning.
Fix warnings from texinfo in the reference manual.

doc/reference_manual.texi:
	Fix the ordering of the menu in the foreign language interface
	chapter so that it matches the sectioning.
Update dead links in reference manual.

doc/reference_manual.texi:
	Update dead WWW links (mainly to stuff that used
	to be hosted at CSSE.)

	Mark up URLs using @uref, so that we get actual
	links in the HTML version of the manual.
Fix URL markup in the user's guide.

doc/user_guide.texi:
	As above.
Fix the documentation of --feedback-file.

compiler/options.m:
doc/user_guide.texi:
	`--feedback-file' requires an argument.

	Fix a spot where an option name is not quoted /
	marked up.
Workaround bug #307.

We encounter internal errors in GCC 4.8.2 on i686 Linux when compiling
runtime/mercury_ho_call.c in grades that use global registers when -fpic is
enabled.  Compile that module at -O0 in the above circumstances; doing so
avoids tickling the bug.

scripts/mgnuc.in:
	As above.
Workaround bug #304.

configure.ac:
	When using non-local gotos force GCC 4.8 to emit error messages
	in a format that mfiltercc can handle.
Make cord foldl tail-recursive.

Make cord.foldl and cord.foldl_pred tail-recursive.  This may be
expected by users as cords are often used as a replacement for lists.

Also make the recursive calls in cord.foldr and cord.foldr_pred amenable
to last call optimisation.  However, they still use stack space
proportional to the size of the input due to calling list.foldr.

library/cord.m:
	As above.

tests/hard_coded/test_cord2.m:
tests/hard_coded/test_cord2.exp:
	Add tests for fold order.

NEWS:
	Announce the change.
Improve handling of the deployment target setting on Mac OS X.

Due to matching against hardcoded versions of Darwin in the configure script
the deployment target for recent versions (10.7 and later) of Mac OS X was being
incorrectly set to 10.3.  This diff makes several changes to the handling of the
deployment target setting on Mac OS X:

- The default deployment target is now set to the same version as the host
  system.  (This is more consistent with the default XCode behaviour.)

- Matching against hardcoded versions of Darwin in the configure script
  for this purpose has been removed.

- There is a new option for the configure script,
  `--with-macosx-deployment-target', that allows the user to control
  what the deployment target for use with Mercury is.

configure.ac:
	Don't determine the deployment target by matching against hardcoded
	versions of Darwin -- we had failed to update this for several
	versions.

	By default set the deployment target to be the same version as
	the host system.

	Add a new option for overriding the default setting of the
	deployment target.

	s/doesn't/does not/ in a spot in order to prevent syntax
	highlighting in vim from going stupid.

README.MacOS:
	Add a paragraph describing how the deployment target is set
	for Mercury and pointing the user towards Apple's documentation
	if they require further information.

NEWS:
	Announce the change to the default value of the deployment
	target setting.
Merge Zoltan's fix for bug 304 onto the 14.01 branch.

configure.ac:
	As above.

	Delete my earlier fix for this problem.
Merge commit 'ba57f4a5df1aa1d9ff71c412c64871e9eec3b20a' into version-14_01-branch
Merge commit '7e1cdb70aa033caaa362d5807d70fa9774cf8d76' into version-14_01-branch
Merge commit 'a5b5c0f05fcad78dd2176cb337f277eb6f06d502' into version-14_01-branch
Merge commit 'ae612d2a4a405e8daf3681172d0c418126a7c820' into version-14_01-branch
Merge branch 'version-14_01-branch'