descvars -> DatabaseDef
descvars slot -> variables_definitions
#56 descvar -> VariableDef
#56 script_output -> ScriptOutput
#56 script_template -> ScriptTemplate
#56 Rename files
#56 Descvars(?=[\(]| <-) -> database_def
#56 Descvar method -> vardef
#56 rebuilding documentation and NAMESPACE
Fix #56 : Merge branch 'fix56_class_name' into dev