Require ConsensusCore 0.5.0

[Tracking bug 21562]

[git-p4: depot-paths = "//depot/software/bioinformatics/tools/GenomicConsensus/": change = 118571]
Update "howto" document to reflect my boost and -fPIC fixes.

[Tracking bug 21562]

[git-p4: depot-paths = "//depot/software/bioinformatics/tools/GenomicConsensus/": change = 118572]