Let make install work

Created by: aroffringa

Fixes #8 (closed) .

Changes:

• Added 'install' targets to the DPPP and makesourcedb binaries, and to the interpolation, ddecal and aoflag libraries
• Renamed the LOFAR default strategies and put their installation command one cmakelist up
• 'DPPP -v' works again, although it does not use versioning yet.
• Using boost::filesystem instead of casacore::File to check for existance of parset, and look for DPPP.parset before NDPPP.parset
• Update Readme file to include make install

.travis/Dockerfile

@@ -13,3 +13,5 @@ WORKDIR /src
 RUN mkdir /build && cd /build && cmake ../src
 RUN ln -s /usr/include/casacore/measures /usr/include && ln -s /usr/include/casacore/ms /usr/include
 RUN cd /build && make -j2
+RUN cd /build && make install
+RUN DPPP