implemented standard bootstrap with weighting
implemented a  user defined consensus threshold
-changed the output of the -f B option to be similar to the output of the -f e option
-fixed bug in per-partition branch length scaler optimization (-f B option)
-fixed problem with failing assertion when -f B was being used
updated README and version history
small fix to facilitate compiling AVX versions on MACs
Added two makefiles for Macs to build the AVX versions of sequential and pthreads-based raxml,
they now use the clang compiler.

Fixed one more bug in the -f B option such that a branch length scaler can also be estimated
for a single partition.
added a more verbose error message for the -f b option that informs the user when the reference tree
passed via -t has a different number of taxa than the bootsrap trees passed via -z
implemented dedicated MPI version called raxmlHPC-QUARTET-MPI, raxmlHPC-SSE3-QUARTET-MPI, raxmlHPC-AVX-QUARTET-MPI
that computes quartets in parallel (-f q option) using MPI.

Added respective Makefiles called Makefile.QuartetMPI.gcc etc.

Updated version number to 740.
added a rudimentary FASTA file parser. If the alignment file passed via -s does not look like
a phylip file, RAxML will try to parse a FASTA-formatted file.
-added Simon's re-implementation of getline called rax_getline() such that it should work/compile on MACs and Windows
merged corrected bs
Merge branch 'customThreshCons'
small improvements