Makefile: add an "install-strip" target.
Makefile: Use standardized DESTDIR instead of inventing our own FULLPREFIX
Makefile: add an uninstall target
Makefile: mark all relevant targets as phony
Makefile: remove some blank lines
Remove forgotten 'S' option from getopt (this is now the 'S' key).
Split decoding and displaying of the civil warning buffer into two functions.
For safety, take the size of the source parameter instead of the size of the structure itself.
Only display the civil warning buffer each three minutes if the first minute is complete.