Doc: clean useless files
Syntax: fix #158
Compiler: fix #160 ; Option to specify the name of the global ..
object.
use 'global' to make it works with node.
Compiler: option to enable nodejs compatibility
Compiler: option to warn about unused variable
Runtime: prefix unused variable with underscore
Revert "Compiler: option to enable nodejs compatibility"

This reverts commit 38dd07fbdb1232734ed3b39b11503ce73356dcec.
Revert "Compiler: fix #160 ; Option to specify the name of the global .."

This reverts commit 15783f8838fd69df87babd9e35f8f66f0d9b077f.
Compiler: portable way to refer to the global object @vouillon
Runtime: fix graphics
Runtime: fix unused warning
CHANGES
Runtime: fix graphics (float precision in arc_aux)
events : add timeupdate