Update test base to enable error traits also for whitelisted errors; Add flag to ignore error comparisons.

- remove GlobalAssumptions
- remove PutException from functions in Engine
- put parse error information into ParseException and generate RError on demand

- pull REnvVars and RProfile into RContext
- introduce ContextInfo for context initialization information
- put RCmdOptions into enum instead of static fields
- make RCmdOptions context-specific, put into ContextInfo
- make all FastROptions static final fields
- remove RContext.activate mechanism
- make all ContextState in RContext final fields, remove StateFactory
- remove systemInitMap mechanism from ROptions