Memory error codes

The default setting is to exit the program, if there is a "memory error".
You can set the variable "_err_alloc" to "1" and switch on error handling.
Every array allocation returns a code to the variable "_alloc".

The codes are defined in the "memory.nah" include:
    code|   error
    ----+----------------
    0   |   no memory
    1   |   allocation ok
    
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