Added Macports installation instructions.

Some libraries do no resolve for some reason, adding LDFLAGS option
solves this.
Merge branch 'topic_macports_readme'
Merge pull request #1 from tvwerkhoven/patch-1

Added /opt/local/lib as well as /sw/lib
Merge pull request #2 from tvwerkhoven/bugfix__sao_fcmp

Included "fcmp.h" in "utils.hh"
Merge pull request #4 from tvwerkhoven/bugfix_default_arg

Fix default arguments
Merge pull request #5 from tvwerkhoven/topic_macports_readme

Added Macports installation instructions.
Fixes to build with GCC 4.7, 4.8, clang and macports
Merge remote-tracking branch 'upstream/master'