added mothurgetpid function. fixed bug with align.seqs related to g++ 4.8 change.  fixed bug in rarefaction.single with shared command if shared file not created by mothur labels not in right order in *.groups.rarefaction. summary.shared sub ample bug, not subampleing. added rjsd and jsd to tree.shared. working on sra command. chimera.slayer blast error bug on linux related to getpid().