Rename csec/ to more standard cbits/.
Use hsc2hs to determine field types, size of TimeSpec, alignment.

The alignment value was wrong. hsc2hs computes the correct value for us.
Mor importantly, the size of a long differs from platform to platform.
Whatever the size of a long, it usually exceeds the range of an Int.
Again, hsc2hs maps a C long to the correct Haskell type that fits, on
every architecture.

Int cannot be assumed to have the same range than that of a word
(pointer size), no matter the platform (see Haskell report - the
compiler is allowed to still some of the low order bits). So using Int
to represent a C long was incorrect.
Merge pull request #14 from tweag/hsc2hs

    Use hsc2hs to determine field types, size of TimeSpec, alignment.