Canonicalise whitespace -- USE -b/-w TO DIFF/BLAME ACROSS THIS COMMIT

Expand tabs as spaces; hard tab characters are no longer to be used
as there is disagreement as to how many columns they should expand to.
Remove trailing whitespace at the end of lines.

After this commit, please do not commit hard tab characters or trailing
whitespace in .c, .h, .pl, or .txt files, and please consider using a
pre-commit hook in your local repository to enforce this.

These steps will minimise the incidental whitespace changes unrelated
to the intended commit changes that make viewing diffs and merging
less convenient.

To compare files prior to and after the whitespace discontinuity of
this commit, use "diff -b" or "diff -w", "blame -w", etc.

(This does not apply to kmin.[ch], which are in theory synchronised with
kmath.[ch] in the klib project, so minimising differences with copies of
this code elsewhere is more important.  Please avoid accidental incidental
whitespace changes in these files too.)

Makefile

@@ -22,7 +22,7 @@
 # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 # DEALINGS IN THE SOFTWARE.
 
-PROG=		bcftools
+PROG=       bcftools
 TEST_PROG=  test/test-rbuf
 
 
@@ -35,15 +35,15 @@ HTSLIB = $(HTSDIR)/libhts.a
 BGZIP  = $(HTSDIR)/bgzip
 TABIX  = $(HTSDIR)/tabix
 
-CC=			gcc
-CFLAGS=		-g -Wall -Wc++-compat -O2
-DFLAGS=
-OBJS=		main.o vcfindex.o tabix.o \
-			vcfstats.o vcfisec.o vcfmerge.o vcfquery.o vcffilter.o filter.o vcfsom.o \
-            vcfnorm.o vcfgtcheck.o vcfview.o vcfannotate.o vcfroh.o vcfconcat.o \
-            vcfcall.o mcall.o vcmp.o gvcf.o reheader.o \
-            ccall.o em.o prob1.o kmin.o # the original samtools calling
-INCLUDES=	-I. -I$(HTSDIR)
+CC       = gcc
+CFLAGS   = -g -Wall -Wc++-compat -O2
+DFLAGS   =
+OBJS     = main.o vcfindex.o tabix.o \
+           vcfstats.o vcfisec.o vcfmerge.o vcfquery.o vcffilter.o filter.o vcfsom.o \
+           vcfnorm.o vcfgtcheck.o vcfview.o vcfannotate.o vcfroh.o vcfconcat.o \
+           vcfcall.o mcall.o vcmp.o gvcf.o reheader.o \
+           ccall.o em.o prob1.o kmin.o # the original samtools calling
+INCLUDES = -I. -I$(HTSDIR)
 
 prefix      = /usr/local
 exec_prefix = $(prefix)
@@ -74,10 +74,10 @@ version.h:
 force:
 
 .c.o:
-		$(CC) -c $(CFLAGS) $(DFLAGS) $(INCLUDES) $< -o $@
+	$(CC) -c $(CFLAGS) $(DFLAGS) $(INCLUDES) $< -o $@
 
 test: $(PROG) plugins test/test-rbuf $(BGZIP) $(TABIX)
-		./test/test.pl --exec bgzip=$(BGZIP) --exec tabix=$(TABIX)
+	./test/test.pl --exec bgzip=$(BGZIP) --exec tabix=$(TABIX)
 
 PLUGINC = $(foreach dir, plugins, $(wildcard $(dir)/*.c))
 PLUGINS = $(PLUGINC:.c=.so)
@@ -121,23 +121,23 @@ vcmp.o: vcmp.c $(htslib_hts_h) vcmp.h
 test/test-rbuf.o: test/test-rbuf.c rbuf.h
 
 test/test-rbuf: test/test-rbuf.o
-		$(CC) $(CFLAGS) -o $@ -lm -ldl $<
+	$(CC) $(CFLAGS) -o $@ -lm -ldl $<
 
 bcftools: $(HTSLIB) $(OBJS)
-		$(CC) $(CFLAGS) -o $@ $(OBJS) $(HTSLIB) -lpthread -lz -lm -ldl
+	$(CC) $(CFLAGS) -o $@ $(OBJS) $(HTSLIB) -lpthread -lz -lm -ldl
 
 bcftools.1: bcftools.txt
-		a2x --doctype manpage --format manpage bcftools.txt
+	a2x --doctype manpage --format manpage bcftools.txt
 
 bcftools.html: bcftools.txt
-		a2x --doctype manpage --format xhtml bcftools.txt
+	a2x --doctype manpage --format xhtml bcftools.txt
 
 docs: bcftools.html bcftools.1
 
 install: $(PROG)
-		mkdir -p $(DESTDIR)$(bindir) $(DESTDIR)$(man1dir)
-		$(INSTALL_PROGRAM) $(PROG) plot-vcfstats vcfutils.pl $(DESTDIR)$(bindir)
-		$(INSTALL_DATA) bcftools.1 $(DESTDIR)$(man1dir)
+	mkdir -p $(DESTDIR)$(bindir) $(DESTDIR)$(man1dir)
+	$(INSTALL_PROGRAM) $(PROG) plot-vcfstats vcfutils.pl $(DESTDIR)$(bindir)
+	$(INSTALL_DATA) bcftools.1 $(DESTDIR)$(man1dir)
 
 clean: testclean
 	-rm -f gmon.out *.o *~ $(PROG) version.h plugins/*.so