-use g_snprintf instead of sprintf and snprintf
-use g_strdup_printf where appropriate
-remove #include "snprintf.h" (as only g_snprintf should be used)
-replace some more alloc/realloc/calloc/free with their glib pendants
svn path=/trunk/; revision=15264
and de-boilerplate another part of the comment.
Fix a test of "octet_aligned" that was setting it to false rather than
testing whether it was false.
svn path=/trunk/; revision=12996
