##VERSIONS:
1.0.15	- F1 now rotates between 3 states : slow > prog running > fast. Little flying sign to show status.
1.0.14	- correct locale
1.0.13	- compatible with factorio 0.15
1.0.12	- correct a bug in on_configuration_changed
1.0.11	- adds a F1 hotkey to toggle acceleration on/off, so that you can stay at slow speed to work on local precise actions.
1.0.10	- change the initial speed to 1 (normal walking speed without any speed stuff)
		  players who want to start running slower than usual walking speed can edit the config.lua file
		  and lower the initial_speed_factor value.
1.0.8	- compatible with factorio 0.14 (equipement grid change)
1.0.7	- removing on_player_left_game event that bugged in MP.
1.0.6	- rework of the whole mod :
		- tests if exoskeleton or other modifiers are present, so now computes the correct normal walking speed.
		- starts walking even slower than normal speed (customisable in config.lua)
		- acceleration increases with max speed (also customisable in config.lua)
		- before uninstall, to recover normal speed, use 
		   /c remote.call( "progrun", "off" )
		 - to re-enable the mod, use
		 /c remote.call( "progrun", "on" ) 
1.0.2	- minor fixes
1.0.1	- Initial release.