Fix warning on automake-1.12.4
warning: 'INCLUDES' is the old name for 'AM_CPPFLAGS' (or '*_CPPFLAGS')
Changed file permissions for log_stats.plot.
Removed obsolete logging facility.
Use pid and ppid to XOR the seed value for random and rand48.
Adding test output file gitignore.
Added missing <unistd.h> include.
Merge pull request #128 from skydrome/automake-1.12

Fix warning on automake-1.12.4
Removed old logging signals.
Removed deprecated signals for chunks passed/failed.
Converted sigc++ slots to std::tr1::function.
Converted sigc::signals to STL.
Added subdirs option to suppress warnings.
Removed all dependencies on sigc++.
Added slot_call_list.
Added 'log.open_gz_file' option.
Fixed an issue with input window.
Added logging of some ui events.
Fixed typo in IPv6 option.
Added brackets around configure parameters.
rtorrent.1.xml: remove schedule and schedule_remove

They were deprecated a long time ago.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>