LF: New opds version

[Markus Vester <markusvester@aol.com>]

Dear opds users,

I have recently discovered a minor bug in opds2h5c which could sometimes produce systematic false detections from partial correlations after the end of a strong Opera signal. This has hopefully been fixed in version 2h6:

 http://df6nm.de/opera/opds2h6.zip

This version should be completely compatible with existing configurations and ini files, so all you have to do is start opds2h6 instead of opds2h5c.

Differences are:
- potential false partial correlations are cross-checked against detections on the same frequency during the last 32 minutes,
- to further reduce possible false detections triggered by strong non-Opera signals, the correlation threshold is now raised with signal strength. By default, it goes up linearly from 15 to 19 dB, starting at SNR -41 dBOp. If desired, this behavior can be modified by dedicated opds.ini entries, 
- the bug in the default filename pattern has been corrected, so the "pattern=*.txt" ini-line is no longer needed,
- unused parts of the code have been removed, resulting in a slightly smaller source and executable.

BTW For the old 16-bit QuickBasic versions before opds2h5b, I had recommended to prevent CPU-load peaks by running the process at lower priority. This seems to be no longer necessary.

Best 73,
Markus (DF6NM)