Note Boost nondefault link path problems in documentation
Move pipeline plotters into pipelining/plotter.h and enable GCC weak linking
Switch to Boost Filesystem 3
Move sysinfo.h/cpp into tpie/
Move sysinfo.h/cpp into tpie/
(cherry picked from commit 5f0bebba1f4b2b53f4bb4d5709d3d347bc469dc9)

Conflicts:

	tpie/CMakeLists.txt
Document sysinfo.h
Remove BOOST_FILESYSTEM_VERSION define
Don't include comparator.h in sort.h, but wait until sort_deprecated.h
fractional_progress::m_init_called shouldn't be public
Add sysinfo::blocksize_bytes
Add file accessor speed test
Add Jakob to authors.dox
Revert "Remove BOOST_FILESYSTEM_VERSION define"

This reverts commit ecb69261019d99c0a4c8793fb890c15a2f5d1c12.
file_accessor: Align blocks to a given block size, and pad the header to align to a 4 KB boundary. Change file_accessor::read and write (item-wise) to read_block and write_block (block-wise). Add a private field file_accessor::m_blockSize, add stream header field blockSize, bump stream header version, remove 6 reserved bytes from stream header.
Merge branch 'cleanup' into filestream

Conflicts:
	CMakeLists.txt
	tpie/CMakeLists.txt
	tpie/array.h
	tpie/file_accessor/file_accessor.h
	tpie/file_accessor/file_accessor_crtp.h
	tpie/file_stream.h
	tpie/fractional_progress.cpp
	tpie/priority_queue.h
	tpie/stream.h
Fix stream_speed_test
Get rid of virtual inheritance in file_accessors
Some changes to temp_file, and file_stream

Conflicts:

	tpie/CMakeLists.txt
	tpie/file_accessor/file_accessor.h
	tpie/file_stream.h
	tpie/stats.h
	tpie/tempname.cpp
	tpie/tempname.h
Small changes
Rename get_tempfile_usage -> get_temp_file_usage