#8 Replace ulong64 wrapper class with typedef

[Hauke Duden]

This multifile patch replaces the ulong64 and long64
wrapper classes with simple typedefs (as discussed here:
http://vcf-online.org/forums/index.php?showtopic=757
)

It also adds the VCF_LIT64 macro and a few utility
functions for accessing the high and low 32 bits of a
64 bit value.

It also fixes a few places in the library where methods
of the old wrapper class were used.

Finally, it fixes a couple of ambiguity errors that
were created by the transition to a typedef (one in the
Strings example, the other in the Color class).

[Hauke Duden]

[kdmult]

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Applied.