afc::IntegerBase::value() is introduced; a TODO is added.
afc::Int32Test is migrated from libcpptest to libcppunit;
tests are executed with CppUnit.
libafc_test is linked with libafc statically;
the dependency upon libcpptest is removed;
libraries are linked with the flag '-Wl,--as-needed'.
Tests are made auto-included into the CppUnit test suite.
Copy-paste mistakes made in unit tests while migrating from libcpptest to libcppunit are corrected.