Addressbook: Fixing gtk-doc comments and adding gtk-doc section headers
Calendar: Fixing gtk-doc comments and adding gtk-doc section headers
Libebackend: Fixing gtk-doc comments and adding gtk-doc section headers
Libedataserver: Fixing gtk-doc comments and adding gtk-doc section headers
ETestServerFixture: Fixing gtk-doc comments.
Restructuring documentation build.

This commit unifies the various EDS related reference manuals into
a single 'eds' reference manual. This comprises libedataserver, libebackend,
libebook, libebook-contacts, libedata-book, libecal, libedata-cal into
a single reference manual. The camel and private reference manuals are
left alone.
Migrated tests/cursor-example to examples/cursor

Examples can be added to the examples subdirectory which does
not belong in 'tests'. Note that the new documentation contains
an examples section, the file eds-cursor-example.sgml is manually
written and includes source code inline, along with some commentary
on the source code example.