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Find skipchain IDs faster

The current way of finding the skipchain IDs is to go through all blocks. As the
`network.Decode` is very slow if points need to be decoded, this takes a long time:
on the current chain (100k blocks), it takes about 5 minutes to decode all blocks.

This method only decodes the necessary fields, which gives a speedup of about
150x-200x.

Instead of a Benchmark, there is only a TestBenchmark, because go's Benchmark
insists on using high numbers of b.N, which take too long...

16 of 16 new or added lines in 1 file covered. (100.0%)

16035 of 25733 relevant lines covered (62.31%)

3287.19 hits per line