import boost-1.55
boost: spsc_queue - merge fixes from boost trunk
Update readme, add ccache hint
linux readme: remove outdated 3.4.x debian mention
Update README_LINUX.md
supernova: make apple clang happy
Merge pull request #1066 from timblechmann/topic/supernova_for_master

supernova: make apple clang happy
Merge pull request #993 from timblechmann/topic/boost_1_55

update to boost-1.55
lang: remove include of "system_timer.hpp", gone from boost-1.55
class library: protect SynthDesc from too many controls. This fixes #256
sclang: post error message when a function statement has too many arguments