Fixed initializations.

tcp_tag still hardcoded.
Added daq_tag debugging for piconfm.
Added missing enabled check.
Updated logging entry.
Implemented empty file transfer.
Fixed reading back empty file.
Added MISUSED state to protect daq_tag of piconfs.
Fixed ring iterators. Still getting garbage head.
Fixed MISUSED debugging.
Took care to not push if keep alive is not done.
Improved last commit.
Fixed uninitialized foot at piconfs.
Fixed spelling.
Beauty fix in piconfm plus fix of last commit.
Fixed data size within header.
Prepared DAQ to reconnect smoothly.
Added debugging entry.
Separated READOUT from ACQUIRE again.

ACQUIRE causes firmware to acquire data and store it within software.
READOUT causes master to read out all the slaves.
Fixed piconfm logging.
Cleaned up DISCARD.