UKUEHN : Various Improvements

Sorry Ulrich - I can't get Github to resolve the merge errors and
preserve your commit notes, so I'll add them here.
Improvements on bit error correction, doc update, preparation for
program installation/package build

Hi,
I committed some further improvements on the bit error correction code,
updated the readme, and implemented a way to install the program in the
linux file system hierarchy (allows for package building).

Regards,
Ulrich

Makefile

@@ -1,12 +1,24 @@
+#
+# When building a package or installing otherwise in the system, make
+# sure that the variable PREFIX is defined, e.g. make PREFIX=/usr/local
+#
+PROGNAME=dump1090
+
+ifdef PREFIX
+BINDIR=$(PREFIX)/bin
+SHAREDIR=$(PREFIX)/share/$(PROGNAME)
+EXTRACFLAGS=-DHTMLPATH=\"$(SHAREDIR)\"
+endif
+
 CFLAGS=-O2 -g -Wall -W `pkg-config --cflags librtlsdr`
 LIBS=`pkg-config --libs librtlsdr` -lpthread -lm
 CC=gcc
-PROGNAME=dump1090
+
 
 all: dump1090
 
 %.o: %.c
-	$(CC) $(CFLAGS) -c $<
+	$(CC) $(CFLAGS) $(EXTRACFLAGS) -c $<
 
 dump1090: dump1090.o anet.o
 	$(CC) -g -o dump1090 dump1090.o anet.o $(LIBS)