applauncher: Improved search path for nwjsmanager.
applauncher: Improved search path for nwjsmanager.

Now you can set the NWJSMANAGERPATH environment variable to change the default location.
Moreover, applauncher does no longer use system() but checks for nwjsmanager using access() and runs it using execv().

gianluca-nitti/nw.js-global-install,gianluca-nitti/nw.js-global-install,gianluca-nitti/nw.js-global-install,gianluca-nitti/nw.js-global-install