Intermediate commit of instrument processing
Another intermediate commit for InstrumentSection processing.
Three level instrument.xml file reading and creating corresponding
display in the instruments dialogue.
Make more than one tag per element possible
Rename local variables in line with layer->tagSet change
Rename layer files -> tagset and substitute MAX_TAGS for hardcoded
numbers
Implement auto tag entry (setting tags to be automatically added to
suitable elements).  Additions to TagSetManager and element addition.
Final packaging of tags & tagsets, including :
showing autotagging state in status bar
excluding default tag from dialogs
Just rebasing