Remove trimming of base_directory in spreadsheet factories

Removed trimming of base_directory in spreadsheet factories. This was trimming the user-defined base_directory in the SpreadsheetAbsolutesFactory.py and then again in the SpreadsheetSummaryFactory.py. For my defined directory, this error was causing the factories to search all of "home/awernle" for relevant spreadsheets instead of "home/awernle/programming/all_spreadsheets". This inevitably found irrelevant files with relevant patterns such as BOU2016adj.min which caused the scripts to fail.

I am not sure what the point of this logic was but I am committing this small change due to the problems it can create.