Add print_n function to different osl structure.

[Haerezis]

Now all the normal "print" function call their counterpart print_n function with a n=-1.

make test shows 100% success.

[Ced]

Thanks, it looks nice, however the documentation does not always mention that the function will print only the n first elements of the list, moreover the fact that a negative value for n will print all the elements is never documented. Minor issues:

• when the function is properly is documented, you should refer at the "n first ... structures" (note the lower case n and plural) instead of "N first ... structure",
• I noticed few very minor coding style spacing pbs, e.g., include/osl/relation_list.h l97, many 4-spaces instead of 2-spaces such as in source/extensions/dependence.c l330, source/relation_list.c l176 and l335 etc.

[Haerezis]

Ok I'll fix that later.

[Haerezis]

I've fixed the different problems you noticed. I've also merged this branch with the master of openscop in periscop so you can merge directly the pull request.

[Haerezis]

I've fixed the few errors mentioned earlier.

[ftynse]

LGTM