Rationale

The SQL script reorderer uses regular expressions to parse SQL statements. This fixes a couple issues I noticed when attempting to reorder the TNPRC upgrade scripts:

• DROP INDEX regex on SQL Server did not model the correct syntax, which meant it mis-parsed the associated table name.
• Parameters to stored procedures (e.g., sp_rename and fn_dropifexists) are comma-separated. On both databases, the stored procedure regexes assumed 0 or more spaces between a comma and the subsequent parameter value (good), but assumed 0 spaces between a parameter value and the subsequent comma (bad). Whitespace is permitted before a comma as well as after, so the regexes should allow it. This issue also led to table-name-parsing confusion.