#71 SVF programming problem with "x SEC" arg to runtest

[Kolja Waschk]

Reported in http://sourceforge.net/forum/forum.php?thread_id=2167032&forum_id=682993

For some RUNTEST commands with an argument specifying a time in seconds like

RUNTEST IDLE 1000E-6 SEC

the following error occurs:

jtag: svf.c:686: svf_runtest: Assertion `run_count > 0' failed.
Aborted (core dumped)

[Arnim Läuger]

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Fix committed as r1351:
The RUNTEST ... <min-time> command requires a previously defined frequency for the cable. It will exit now gracefully in case the frequency setting is missing.
The player will now revert back to the frequency setting that was active when SVF parsing started (required by SVF spec).