[API Script] New method convoy.is_following()

[Yona-TYT]

Thinking about making a small modification to the tutorial.

https://github.com/simutrans/simutrans/pull/3

[prissi]

Github pulls will be ignored. Anyway, you implementation was awkward, calling a tool for such a simple, even local function. I have put this in the API, r11216

[Yona-TYT]

wow I didn't expect you to use "sint32", I guess it's a substitute for boolean variables.

Line 369:

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* @returns true if convoy is currently waiting (for way clearance)
The description is wrong.

[ceeac]

Line 369:

Corrected in r11222.