removed all Qt progressbar stuff as it is too fragile currently and it would take too much time to "do the right thing"
remove -p command line switch
more GUI stuff removal
add new "logging" keys in yaml_layout (not implemented yet)
added "estimated remaining time" to log
read logging.level from yaml file
implemented log levels (only tested "periods" level)
version 0.8.2 is not yet released...
remove hardcoded path from usersguide\make.bat
set logging.level to "processes" in test simulation
start updating the release notes
partially document log levels
document logging/level properly
update changelog (closed #127)
Merge branch 'liam2-127'

Conflicts:
	tests/functional/simulation.yml