GbE Decoding works now

First version of GbE decoding implemented. Still experimental, need some
cleaning up.
EXPERTS ONLY!
Switched off all error messages

Switched off all error messages to speed up decoding
Improved read loop in THldEvent class

Improved read loop for subevents in THldEvent class and optimising
padding byte skipping
Implemented multiple subevent IDs

Multiple subevent IDs are now supported; the subevent IDs are read from
a text file;
Ignore parsing error message

Temporarily switched off parsing error message as it is also triggered
by a missing CTS package; need to implement an error ignore option;
Improved decoding error handling

Decoding error handling now using a bitset to signal error source; also
general improvements on decoder part;
Switch On/Off Event Padding

User is able to switch on/off event padding; this is needed to read A1
TRB data stream which does not adhere to event size principle;
Merge branch 'GbEDecoding' into BarrelDirc