Repair of some of the lost parameter filters history
Added getter for protected parameter
git test..
(undo) git test..
changed paramfilter type to intptr_t
added support for numeric parameters, tested with rt_sigaction
added experimental support for open syscall path param
added support for multiple parameters
dynamic parameter filter (prototype, not tested)
dynamic parameter filter bug fixes
initia stages of runtime dynamic filters
integrated context for dynamic filters
Investigated access4 syscall problem, small changes to filter.
Changes as suggested by nickm

- char* to const char* and name refactoring
- workaround for accept4 syscall
added openat parameter filter
small filter changes; openat as separate function
removed open flags (postponed), added mmap2 flags
switched to a design using filters as function pointer arrays
fully switched to function pointers; problems with socketcall parameters
clean stable version