FAQ updates for P6

[Tracking bug 25700]

[git-p4: depot-paths = "//depot/software/smrtanalysis/bioinformatics/tools/GenomicConsensus/": change = 141128]
Add P6-C4 to the list of "mixable" chemistries

We might need to get this into 2.3 as a patch

[Tracking bug 25700]

[git-p4: depot-paths = "//depot/software/smrtanalysis/bioinformatics/tools/GenomicConsensus/": change = 141129]
Switch internal tests over to tools provided by our new GNU module
system, instead of using my little stash of tools.

[Tracking bug 25700]

[git-p4: depot-paths = "//depot/software/smrtanalysis/bioinformatics/tools/GenomicConsensus/": change = 141208]
Add missing line continuations

[Tracking bug 25700]

[git-p4: depot-paths = "//depot/software/smrtanalysis/bioinformatics/tools/GenomicConsensus/": change = 141223]
Need to explicitly load module setup

[Tracking bug 25700]

[git-p4: depot-paths = "//depot/software/smrtanalysis/bioinformatics/tools/GenomicConsensus/": change = 141224]