remove charset.alias directly
fix incorrect comment
add more documentation
only get counts if needed
add scons helper
add audit for scons
MongoDB: use scons helper
bsponmpi: use scons helper
clam: use scons helper
fceux: use scons helper
ffmpeg2theora: use scons helper
gmtl: use scons helper
gpsd: use scons helper
gringo: use scons helper
libmongoclient: use scons helper
libswiften: use scons helper
makensis: use scons helper
ori: use scons helper
pplatex use scons helper
pyexiv2: use scons helper