added plugin function that is called when string is matched.  see tstringsearch plugin for how it can be used to taint the matched string.
adding panda stuff to etags command
committing a bunch of stuff involved in taint system callbacks.  will need to merge it with ryans
plugin_plugins compile at least
added an assert to one of the callback reg fns
very bloody minor
syscalls: compile correctly on x86
manual merge of tstringsearch plus ppp with master.  compiles and runs.  well, almost.  tstringsearch works and uses ppp.  but the syscall querying of taint at network out isnt in there.  it was a hacked-up version of syscalls plugin that did it.  either we are going to do it using Joshs nicer version or with Ryans network taint.
minor manual merge
plugins: add mechanism for plugins to call into each other, not just back out
Update ppp.md