initial commit: skeleton of C files
adding gitignore
document purpose of created functions
improve Makefile with auto-dependencies and some convenience targets
include rdtsc (from mcert/misc/librdtsc@r2135)
minor fix: Makefile use OFILES; extend .gitignore with newly created dependencies file
imported hourglass routine (from diss/chap02c_realtime.tex) and basic statistics (min/avg/max)
switched to C11, activated more warnings (except unused parameters) and started to const some argument pointers
add histogram
add recording list of gaps above threshold
include warm-up; deactivate rdtsc_ticks_per_sec() because it does not work reliably.
add command line arguments
implement new calibration method

The calibration from realfeel does not work reliably,
but the new implementation has the same problems.
It is probably due to the power governor switching the CPU frequency...
initial README file
Merge remote-tracking branch 'origin/master'