fix to prevent global context pollution
Don't show internal function after displaying message
Protect+ReadProtect symbols & make MATLABCell private
Merge branch 'mma-dev' of https://github.com/rsmenon/MATLink into cdev
reintroduce MATLABCell, bump version, remove TODO, read protect the rest.
Merge branch 'mma-dev' of https://github.com/rsmenon/MATLink into cdev
Fixed double error reporting in MSet.
Simplified MSet error reporting for better reliability. Removed checkExpression[].  Added extra checks for field names (avoids crash in mengine on incorrect field names such as "*").  Improved descriptiveness of MSet errors.
Improved test coverage:  MSet errors are tested now.