File functions

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Declare these file functions:

 http://www.unitedti.org/forum/index.php?showtopic=9412&pid=142032&st=0&#entry142032

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With test code in demo's main.c to remove

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bsl's code is untested an doesn't seem to work, we're waiting for more info.

 http://read.pudn.com/downloads40/sourcecode/embed/140204/file/PCDISK.H__.htm and  http://read.pudn.com/downloads85/sourcecode/embed/327529/FAL/INC/FAL.H__.htm may help (the first implementation of DSTAT seems closer to bsl's code than the second).

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Seems to work -> test it and declare the functions.

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bwang has updated his skeleton with the definitions:  http://www.omnimaga.org/index.php?topic=2255.0

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Ndless 1.7 defines NU_Get_First, NU_Get_Next, NU_Done and struct dstat. But the listing function needs to be tested and the missing syscalls added.

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Also add fseek, ftell, fflush:  http://www.unitedti.org/forum/index.php?showtopic=9468&pid=142246&st=0&#entry142246

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fseek added to Ndless 1.7.