Reduce the amount of noise when reporting errors

- Print stack trace in case of parsing problems of the joran config file
- RequestLogRegistry instead of RequestLogMapper
- print Status list only in case of errors or warnings

Moved to core module the common functionnalities
Minor modifications on the other classes (format,...)

Better StatusPrinterTest

Added a trick in OptionHelper to load classes 

- test parsing of durations where the init is specified in upper case 

Added filter support

Verified that exceptions print correctly

ClassNameAbbreviator.java now has a public constructor

- Improved toString in Duration

Updated test case
Minor javadoc modifications to TimeBasedRollingTest

  of the week is Monday instead of Sunday.
- Renamed InterpretationContext.addProperty as addSubstitutionProperty
- Fixed bug in PropertyAction

- Other Minor changes