Use the facilities in <boost/timer/timer.hpp> instead

[junghans]

In file included from /tmp/junghans/spack-stage/spack-stage-votca-xtp-1.6_rc1-24mgj3zjwkzycitmnnxbsizxtpmsrcfz/spack-src/src/libxtp/calculators/kmclifetime.cc:21:
/home/junghans/spack.git/opt/spack/linux-centos7-haswell/gcc-8.2.0/boost-1.70.0-z4v74hllqtkbdwbgivc7eoraz7wor4ft/include/boost/progress.hpp:23:70: note: #pragma message: This header is deprecated. Use the facilities in <boost/timer/timer.hpp> instead.
 BOOST_HEADER_DEPRECATED( "the facilities in <boost/timer/timer.hpp>" )
                                                                      ^

[JensWehner]

@junghans At the moment it is dperectaed but will be added in 1.72 in the new header. So what can we do?

boostorg/timer#12

[JensWehner]

The other option is just delete the progress bars. Can we ignore that message for the moment?

[junghans]

If it is only fixed in the upcoming boost-1.72, let's leave it for now!