(ham/predict) Updated 2.2.3 to 2.2.5

Release 2.2.5:
By John A. Magliacane <kd2bd@amsat.org> (05-May-2018):

* Fixed coding bugs identified by GCC v8.1.0.

* Re-arranged GCC arguments in installer.c for better
  compatibility with more recent versions of GCC.

* Added a -dp command-line option to PREDICT to
  provide quick Doppler shift estimates in CSV format.
    (Thanks Joeal Subash)

* Updated the documentation to reflect the changes.
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Release 2.2.4:
By John A. Magliacane <kd2bd@amsat.org> (12-Mar-2018):

* Fixed a bug affecting the -f switch that sometimes caused
  a failure to return proper output.  (Tnx: Andrej Lajovic)

* Fixed a bug in installer.c that sometimes caused a failure
  to properly install PREDICT's executable into /usr/local/bin
    by default.

* Added <errno.h> header to gsat-1.1.0/src/callbacks.c
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(mef)