restore old pkg-config file
cmake install pkg-config
Merge pull request #16 from da2ce7/pkg_config

cmake install pkg-config
cppcheck: fix variableScope in opentxs-core
Merge pull request #15 from toxeus/fixScope

cppcheck: fix variableScope in opentxs-core
Some anyoption related changes:
- Added AnyOption::findOption
- Moved anyoption.cpp to api lib
- Replaced #include <anyoption.hpp> in opentxs.hpp with class AnyOption;
- Changed #include <anyoption.hpp> to #include <anyoption/anyoption.hpp>
  to remove specific dependency_include_dir
Some renaming and reordering of standard arguments in opentxs.cpp
Switch to stream logging in opentxs.cpp