Enumerate common error/warning messages

[vazexqi]

We have captured the error/warning messages from refactorings. This allows us to determine what are the common errors/warnings that users encounter and perhaps offer better interfaces for quickly notifying of such errors, preventing such errors, etc. So far, no other work has tried to categorize the common error/warning messages that developers encounter while using tools.

The list of code changes needed to support this analysis will be documented here. The actual results will be written in our wiki page.

[reprogrammer]

@vazexqi,

Would you add the query we wrote for listing the error messages of "change method signature" to scripts/analysis-queries.sql?