New dissector support, SHIM6
checked in with the following modifications :
- use of proto_tree_add_item whenever possible (addition of several hf_items),
- use distinct subtree idx for each subtree,
- addition of some subtrees,
- split shim_opts in several functions,
- accurate incrementation of offset in locator preferences (in case of option length > 3)
- add true_false_string for critical options and protocol differentiation (hip, shim6)
- add ipv6.shim6.checkksum_good, ipv6.shim6.checkksum_bad, cksum expert info
section added to AUTHORS
svn path=/trunk/; revision=21390
-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