This also enabled test_cleanup, test_nonstandard and test_aligntoseqres which
were previously skipped with 'make check' indep. of compound lib availability
(simply because unittests are launched with 'python' and not with 'ost').

- ProfileColumn.HHblitsNullModel as extra fixed null model
- ProfileHandle.AddColumn method now adds a character to the sequence
- ProfileHandle has a default null model (HHblits) always set
- ProfileHandle attributes sequence and null_model are now read-write
  (replaced SetSequence, SetNullModel)

this pops up as warning when compiling with a super new gcc (6.2)

The code is included in the seq.alg module and it is documented (with an
example) in seqalg.rst. The main new functions are:
- clip_start = seq.alg.ClipAlignment(aln)
- d_map = seq.alg.CreateDistanceMap(aln)
- var_map = seq.alg.CreateVarianceMap(d_map)
- dist_to_mean = seq.alg.CreateDist2Mean(d_map)

This allows the easy usage of the alignment algorithms on the c-level.
The storage to the info object has been removed.

streaming down  the hmms in a compressed format with limited
accuracy to save memory

export them to Python