make file paths more robust
use slightly modified Note interface
add functionality for xml format
script to convert format from i2b2 to xml and back
temporarily stub out format.py to hook up with click
Added argument to specify output format (not used yet)
Merging with scripting
Bugfix for reading blank lines in Note::read_i2b2()
added functionality for i2b2<->xml format command
fully working format conversion (unless going from a format back to itself)
renamed Note::write_i2b2() to Note::write_i2b2_con() for consistency
Changed call to Note method because of renaming