Qfit

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New Features
* Now QFit supports the direct control of the window by manipulating `Fit` object. Currently we support
* `Fit.close()`: shut down the app
* `Fit.hide()` and `Fit.show()`: hide and re-show the window whiling keep things running

Bug fixes
* Button `resultToPrefit` does not update the view
* Eliminate warning messages
* Increase the stability when fitting

Bug Fixes
* Removed the requirements for candidate z data must not have repetitive columns/rows

Other Fixes
* Now `qfit` work with `qutip > 5.0` and `bumpy > 2.0`

This hotfix addresses a bug on spectrum settings that has been observed by Windows users.

Bug fixes
- Fixed the issue where changes to the spectrum settings had no effect.