handle showing compressed ASTs
more line number nodes
make convert(Bool, true) a bit saner
Stat: modularize as FileStat module.
base/loading.jl: move require & include into their own source file.
LOAD_PATH: don't look for modules in Julia home or extras.

Also beautify the "stdio passthrough ok" message even further.
rename base/export.jl => base/exports.jl

Also use printf instead of echo for spawn tests since printf tends
to respect the escape codes.
Speed up Frobenius norm by letting it call Blas for BlasType matrices.
Undo replacement of &0. in BLAS.syrk ccall.
add option to turn color printing on/off. fixes #2053

to force color on:  --color={yes,1,true}, --color
to force color off: --color={no,0,false}
Improve documentation of function signatures