When row counts are known ahead of time, select, insert, and update cursors' progress reports should include the estimated time of completion

[jjr8]

The work required to implement this includes:

• Enhance ProgressReporter to allow TotalOperations to be set after the ProgressReporter has been started.

• Enhance the cursor classes to have a rowCount parameter. The SelectCursor and UpdateCursor classes can obtain it automatically when where == None.

• Search the entire code base for SelectCursor, InsertCursor, and UpdateCursor and pass in rowCount where appropriate.

[jjr8]

Implemented in [126], which will eventually be released in MGET 0.4a1.