bitvec: Add get/set byte sequences

The new functions bitvec_get_bytes and bitvec_set_bytes copy
byte sequences from bitvecs to uint8_t arrays and vice versa.
While the bytes in the bitvecs do not need to be aligned, the uint8_t
arrays always are. In case the bytes in the bitvec are aligned, the
implementation uses memcpy.

Note that the implementation like the other existing functions assume
MSB first encoding.

[hfreyther: Squash the comment fix into this commit as well]

Sponsored-by: On-Waves ehf
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 9d14350..2411afa 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -11,7 +11,8 @@
 		 logging/logging_test fr/fr_test			\
 		 loggingrb/loggingrb_test strrb/strrb_test              \
 		 vty/vty_test comp128/comp128_test utils/utils_test	\
-		 smscb/gsm0341_test stats/stats_test
+		 smscb/gsm0341_test stats/stats_test			\
+		 bitvec/bitvec_test
 
 if ENABLE_MSGFILE
 check_PROGRAMS += msgfile/msgfile_test
@@ -38,6 +39,9 @@
 bits_bitrev_test_SOURCES = bits/bitrev_test.c
 bits_bitrev_test_LDADD = $(top_builddir)/src/libosmocore.la
 
+bitvec_bitvec_test_SOURCES = bitvec/bitvec_test.c
+bitvec_bitvec_test_LDADD = $(top_builddir)/src/libosmocore.la
+
 conv_conv_test_SOURCES = conv/conv_test.c
 conv_conv_test_LDADD = $(top_builddir)/src/libosmocore.la
 
@@ -128,7 +132,8 @@
              fr/fr_test.ok loggingrb/logging_test.ok			\
              loggingrb/logging_test.err	strrb/strrb_test.ok		\
 	     vty/vty_test.ok comp128/comp128_test.ok			\
-	     utils/utils_test.ok stats/stats_test.ok
+	     utils/utils_test.ok stats/stats_test.ok			\
+	     bitvec/bitvec_test.ok
 
 DISTCLEANFILES = atconfig