Remove unused "getConfig()" method.  A new way is to have high-level
APIs that access the configuration table without clients reasoning
about the string table.  The string table is an implementation
detail.
Factor CheckerManager to be able to pass AnalyzerOptions to checkers
during checker registration.  There are no immediate clients of this,
but this provides a way for checkers to query the options table
at startup instead.
Properly sort list.