SAMtools with foss-2014b and zlib 1.2.8

It seems to be recommended with bump the zlib version and it already exists for both toolchains.

Also, I think it makes mroe sense moving forward with foss-2014b

bumped the version in intel-2014b as well.
hmm, this may be problematic... this existing SAMtools may be used together with other things that already have zlib 1.2.7; bumping the version here would make those incompatible with each other