Log Message:
Updated ham/fldigi to 4.0.15

=Version 4.0.15=

2018-01-18  David Freese  <w1hkj@bellsouth.net>

        e87f41a: ARQ server
        5ab6914: Signal gain

=Version 4.0.14=

        f799522: linux shutdown
        29593c8: remote logbook
        4e87d16: ARQ exit seg fault

2018-01-09  Stelian Pop  <stelian@popies.net>

        e09d167: WEFAX auto center behavior
        be34220: WEFAX phasing change button
        2dee90e: RTTY configure initializers

2018-01-07  David Freese  <w1hkj@bellsouth.net>

        a5e88af: File aging
        f028159: OS X shutdown
        38b294a: PSK IMD
        a7d67d8: Spectrum Display
        daa6d43: Warnings in sound.cxx
        eb0caa4: OS X app paradigm