Changes:
* improve support for decoding the alarm messages by showing the main German
regions which are affected. Note that this was an experimental and now
unused system. With permission from Mr. Wenzelewski from DIN
* Doxygen support, provide a Doxyfile (not supported by the port yet)
* Small fixes to the FidoCADJ schematics
* library:
- assign date/time fields more independently so that errors are corrected
faster
- record the accumulated minute length at the end of each line in the log
file, preceded by an 'a'. These values are read back by get_bit_file()
- redesign the calculations for the accumulated minute length to be more
accurate in case of reception errors or reading log files. Time can now
be adjust forwards and backwards.
- record the minute cutoff value at the end of each line in the log file,
preceded by a 'c'. These values are read back by get_bit_file()
- skip consecutive newlines in the log file
- use a more accurate sleep time when receiving live bits
- set upper bound of hw.freq to 155,000 Hz
- API cleanups (types sanitized, const qualifiers added, some renames)
- algorithm and code cleanups
* dcf77pi:
- show the accumulated minute length each second instead of each minute
- show the minute cutoff value
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