add a template of main class
add some elements to configuration file
rename the deafult configuration file
add a class to parse config xml files
implement a function to load config values as just texts
[REFACTORING] make a new package for configuration
add usage information in some enum
add an enum for  clone detector
change the structure of config xml file
add a function to get corresponding VersionControlSystem
add a function to get corresponding Language
add a function to get corresponding ElementType
add a function to get corresponding ElementEqualizer
add a function to get corresponding DBMS
add an enum for clone class mapping algorithm
[BUG_FIX] bugs in canBe are fixed
add an enum to represent algorithms for mapping elements
update ConfigLoader to have concrete configuration values
remove unused function
add some fields to Config