Fix trace again

Remove Trace from SyslogWriter interface

Expose the Err helper from the global logger

make TimeFormatUnixMicro var exportable (rs#189)

Fix a few typos / clarify. (rs#169)

console: handle timestamp in ms correctly + fix UTC

Fix console write with missing level field

Fix console writer when unix time stamp and/or no message field is used

Add a new time format for UNIX timestamp in milliseconds

Add CallerWithSkipFrameCount to the Context (rs#98) (rs#135)

Add the ability to skip a specified number of stack frames
on a per context basis. Before this toe CallerSkipFrameCount
could only be set globally.