Merge pull request #2075 from pbiering/logging-trace

log/changelog

log/sharing: replace legacy trace log

sharing/doc: cosmetic review

log: add additional log level test cases

storage/log: replace legacy trace log

log: remove eol trace_on_debug

log/config parser: permit all available log levels

server/log: remove obsolete log lines

item/filter: replace legacy trace log

item/log: replace legacy trace log

report/log: replace legacy trace log

proppatch/log: replace legacy trace log

propfind/log: replace legacy trace log

log/doc: add new log levels