[Gpsbabel-code] Another MTK patch

[Lorenzo M. C. <lo...@sa...>]

The enclosed patch does restructure mtk_parse to disentangle the end lines 
from the mess Sato and myself have done while adding m241 support and to 
unconditionally enable block printing at high debug levels.

It doesn't depend on my previously sent ones.

Per, Sato, do you think it can be applied?

Thank you very much, yours

 	lorenzo

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