[Everyone] psrchive update

[Willem van Straten]

Hi everyone,

psrchive's dependence on the epsic library is now modelled as a git
submodule, which should help to keep the projects better synchronized
going forward.

Unfortunately, this update introduced a minor hiccup: if you previously
checked out psrchive from the project git repository hosted by sourceforge,
and you perform a "git pull" (or run the psrchive/update script) to get the
latest version, then it will be necessary to re-run the bootstrap and
configure scripts before recompiling.

When re-running the configure script, it may be necessary to recall any
relevant environment variables and command-line options used.  These are
recorded in the third line of the config.log file that is produced in your
build directory (example appended below).

Please let me know if you run into any issues with this latest change.

Cheers,
Willem

--- example config.log ---

This file contains any messages produced by compilers while
running configure, to aid debugging if configure makes a mistake.

It was created by PSRCHIVE configure 2020-01-10+, which was
generated by GNU Autoconf 2.69.  Invocation command line was

  $ ../configure --prefix=/blah/blah/blah
--enable-shared CXXFLAGS=-std=c++11 F77=gfortran
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