moving thread_safe_signals to new directory structure

[SVN r6987]
Moved more thread_safe_signals files over to
new directory structure.



[SVN r6999]
Added files for doxygen home page


[SVN r7004]
move thread_safe_signals to new location

[SVN r7005]
Put svn command in verbatim block.



[SVN r7008]
Removed absolute paths from Doxyfile.


[SVN r7009]
Fix eol-style and mime-types

[SVN r7564]
Got rid of doxygen-generated main page, instead integrated
its content into boostbook docs (note I'm building them with 
boostbook from sandbox/boost_docs now).



[SVN r39426]
Indent with spaces instead of tabs, as specified by boost coding guidelines.



[SVN r39454]
Removed some reminders of obsolete EPG namespace.



[SVN r39455]
Pruned some dead debugging code.



[SVN r39456]
track class no longer exists.



[SVN r39457]
We aren't using visit_each anymore (unless backwards compatibility
for boost::trackable is brought back), so take it out of the
reference.



[SVN r39458]
Minor documentation improvements.  Documented
boost::signalslib as the "official" namespace used by
thread_safe_signals.



[SVN r39459]
Added an example program referenced in the tutorial.



[SVN r39460]
Deleting example, because I want to instead create it with
an svn copy of the program from the signals library in the
main boost trunk.



[SVN r39461]
Copied example from Boost.Signals in main boost trunk.



[SVN r39462]
People should use slot_type to forward slots, not
slot_function_type.



[SVN r39463]
Moved boost::signalslib::detail::slot_base to boost::signalslib::slot_base,
since it has been exposed in the API by one of the slot::track
methods.




[SVN r39493]
More documentation improvements.  Fixed documentation of
some protected members using new docbook <access> tag.  Added
documentation of slot_base, now that it's no longer in
the detail namespace.  Added documentation of "preferred
syntax" slot class constructors.  Got rid of a bunch
of <simpara> (no longer needed after css tweak).


[SVN r39495]