[+] add support for using wall time for profiling. Lots of people download v0.53.
[+] clock type shall be saved in save(), merging two different profile results with different clock types is
+[-] make sort order+sort type normal strings for more readability and easy calling.
[-] maybe add a pause/resume functionality for _yappi. When wee retrieve the stats and the profiler is on user is
shown the internal functions used by yappi. These should be discarded?
[-] Test debug build after merging the wackou branch.