abyss: New option, --disable-popcnt

Optionally disable abyss-map using the POPCNT instruction.
Compiles cleanly with boost 1.5.3. No longer requires boost149.
Revert anomalous changes of f0680ba5.
Use :autoconf and :automake rather than 'autoconf' and 'automake'
abyss 1.3.5
seqtk: New formula
perf 5.11

Closes #99
samtools 0.1.19

seqtk has been removed from this package by upstream.
openblas: 0.2.6

Closes #113
bwa 0.7.3a
shogun: 2.1.0 new formula
scalapack: 2.0.2 - New formula.

Closes #10
Merge remote-tracking branch 'upstream/master'