Drop code to handle SVN
Check git config for user's name and email address
configure.ac: Update link to cygwin FAQ.
docs/doxygen_api.conf.in,docs/doxygen_source.conf.in: Update to
avoid warnings about obsolete tags from newer doxygen.
docs/doxygen_source.conf.in: @MAKEINDEX@ isn't substituted, so just
use literal 'makeindex'.
Improve git branch usage
configure.ac: Enable automake option 'subdir-objects' to avoid
warning from newer automake.
Update .gitignore files
include/xapian/enquire.h: Fix incorrect parameter name in doxygen
comment.
include/xapian/geospatial.h: Drop documentation of parameter which
the method doesn't actually take.
backends/flint_lock.cc: Use F_OFD_SETLK where available, which
avoids having to fork() a child process to hold the lock.  This
currently requires Linux kernel >= 3.15, but it has been submitted
to POSIX so hopefully will be widely supported eventually.  Thanks
to Austin Clements for pointing out this now exists.
Rename svn-ci to xapian-commit
HACKING: Rename svn-ci to xapian-commit (see #621).
backends/dbcheck.cc,backends/flint_lock.cc,backends/flint_lock.h,
examples/copydatabase.cc,tests/api_backend.cc: Drop support code for
building on OS/2 with EMX - EMX was last updated in 2001 and comes
with GCC 3.2.1, which pre-dates C++11 and we're going to require
a compiler with good C++11 support in the near future.