Modified Ctrl-C exit handling of mstpcap to make exit cleaner on Win7.

git-svn-id: svn://svn.code.sf.net/p/bacnet/code/trunk@2601 1e814d3a-8a88-4260-be86-c0dc25669c1e
Fixed mstpcap ctrl-c on Linux. Fixed mstpcap makefile on linux, while excluding cygwin.

git-svn-id: svn://svn.code.sf.net/p/bacnet/code/trunk@2602 1e814d3a-8a88-4260-be86-c0dc25669c1e
Cleaned up some compiler warnings.

git-svn-id: svn://svn.code.sf.net/p/bacnet/code/trunk@2603 1e814d3a-8a88-4260-be86-c0dc25669c1e
Added mstpsnap to makefile.

git-svn-id: svn://svn.code.sf.net/p/bacnet/code/trunk@2606 1e814d3a-8a88-4260-be86-c0dc25669c1e
Updated mstpcap documentation.

git-svn-id: svn://svn.code.sf.net/p/bacnet/code/trunk@2609 1e814d3a-8a88-4260-be86-c0dc25669c1e