remove signal subtraction and simplify output format

Makefile

@@ -1,12 +1,10 @@
 TARGET = ft8d
 
 OBJECTS = \
-  timer_module.o crc10.o crc12.o crc.o ft8_downsample.o sync8d.o sync8.o \
-  grid2deg.o four2a.o deg2grid.o chkcrc12a.o determ.o fftw3mod.o \
-  baseline.o bpdecode144.o geodist.o azdist.o fix_contest_msg.o \
-  to_contest_msg.o bpdecode174.o fmtmsg.o packjt.o extractmessage174.o \
-  indexx.o shell.o pctile.o polyfit.o twkfreq1.o osd174.o encode174.o \
-  genft8.o genft8refsig.o subtractft8.o db.o ft8b.o ft8d.o
+  crc12.o crc.o ft8_downsample.o sync8d.o sync8.o four2a.o deg2grid.o \
+  chkcrc12a.o determ.o fftw3mod.o baseline.o bpdecode174.o packjt.o \
+  extractmessage174.o indexx.o shell.o pctile.o polyfit.o twkfreq1.o \
+  osd174.o db.o ft8b.o ft8d.o
 
 CC = gcc
 FC = gfortran