Minor cosmetic changes

* Moving fflush from one line to another (which actually has it's purpose)
* Reading tnow2 from the correct source

Neither of these changes are expected to make any real difference.

Category: cosmetics
Structure in place

All major parts in place, embryonic functionality somewhat working. Only one
file-operation mode implemented (very crude), a fool-proof but slow "always
close, always reopen" approach. Some new needs detected, per category below:

1) Behaviour changeable by flags. Most needs can me grasped by inspecting
modglobals in libsampler and libmlist.

2) Need of n'th line regex selector. Usable for liles plike /proc/cpuinfo

3) Need ability to extract data from continuously updated log files. Several
sub-cases depending on if rate-monotonic, file itself or another event is
driving the sample. Among other multiple changes might have occurred
in-between tho events.

Category: development