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Removes AddOption and GetOption.
RFC 2131 specifies that options may only appear once (Section 4.1). If
an option does appear more than once, its byte values must be
concatenated.
RFC 3396 further specifies that to send options longer than 255 bytes,
one option may be split into multiple option codes, which must be
concatenated back together by the receiver.
Both of these are concerned with the byte representation of options.
Fact is, based on both RFCs one can say that an option may only appear
once, but may be composed of multiple values.
Because an option may appear only once logically in any case, we remove
the AddOption and GetOption functions and leave only UpdateOption and
GetOneOption.
Also remove all additions & checks of the End option - the marshaling
and unmarshaling code is exclusively responsible for that now.
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