systrace and syscount

**systrace** would be an strace-like tool (with limited parsing of arguments). It would provide a general overview of process syscall activity, which can then be examined in more detail with argdist/trace or dedicated tools.

**syscount** would provide syscall statistics on the whole system or a specific process. Should probably mimic [syscount](https://github.com/brendangregg/perf-tools/blob/master/syscount) from Brendan Gregg's perf-tools.