Remove Deuce's jsexec object, define js.startup_dir instead, which is now
(potentially) non-blank for external JS modules configured in SCFG->External Programs, as well as those executed from jsexec. If the startup_dir is specified in SCFG and no path is given for the .js file, it will look in the startup_dir first. js.startup_dir will be an empty string for all other cases (currently).
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