Unclear Error Message for "Old" Overlap Values.

[sjteresi]

Error: "The windows for MergeData do not match with the windows of Overlap" Described in transposon/merge_data.py under _validate_windows function Easily occurs when there are previously calculated Overlap files on disk, and the user is re-running TE Density, but this time with a new configuration file (a different set of windows). Error message is unclear as to what must be done to fix this. Room for improvement.

Potential fixes?

• [ ] Add flag in process.py that deletes the overlap files automatically when the pipeline starts
• [x] Edit the error message to tell user that the overlap files must be deleted.

[sjteresi]

@teresi I have edited the error message for _validate_windows() in merge_data.py in branch CodeCleanup commit SHA 76237503d3ff67159b9e539eaa3f7f23afdb2322

Let me know if this is a sufficient fix, and if you think doing the first check box is necessary