regex in OptionParser prevents compilation from old versions of g++

[guilhermesena1]

gcc/g++ 4.8.5 is the default g++ compiler in many operating systems, including ubuntu, osx and centos. Many users of smithlab software don't have superuser access to install a more recent version, and we shouldn't require someone to upgrade their g++ just to install these tools.

If we remove the regex functions from OptionParser, smithlab_cpp compiles successfully. Most regex functions have to do with cleaning trailing whitespaces, which we can easily reimplement.