New functions CONF_load_bio() and CONF_load_fp() to load a configuration
file from a bio or fp. Added some more constification to the BN library.

util/libeay.num

diff --git a/util/libeay.num b/util/libeay.num
index 56bff65..3236c3a 100755
--- a/util/libeay.num
+++ b/util/libeay.num
@@ -1777,3 +1777,5 @@
 BIO_new_bio_pair                        1802
 BIO_ctrl_get_write_guarantee            1803
 CRYPTO_num_locks                        1804
+CONF_load_bio                           1805
+CONF_load_fp                            1806