libpsdxx [DOC]: state dependency of test program

src/libs/README.dependencies

@@ -99,6 +99,7 @@ C++ libraries
     libraries: libpsdxx.a
     external dependencies: fftw3
     internal dependencies: libaff libfourierxx libtsxx
+    test program dependency: libtfxx
     checked: 06.01.2019 (tforb)
   libtsxx
     language: C++

src/libs/libpsdxx/README

@@ -46,4 +46,6 @@ Dependencies
 This library requires code from libaff, libtsxx, libfourierxx.
 An external dependency is fftw3
 
+The test program requires libtfxx additionally.
+
 ----- END OF README -----