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New license based on the unidoc model (unidoc#294)

* Style fixes.  Fixes for tests. Should not fail with version updates in the future.

Functions to copy and remove sheets (unidoc#281)

* Add funcs to remove sheet from workbook
- RemoveSheet added to remove sheet by index
- RemoveSheetByName added to remove sheet by its name
* Add `CopyRelationship` func to `Relationships`
* Add funcs `CopySheet`, `CopySheetByName`
- `CopySheet` copies sheet at the specified index
- `CopySheetByName` copies sheet with the specified name
* Make `CopyRelationship` return copied rel and bool flag
* Add func `CopyOverride` to `ContentTypes`
* Add test for `CopyRelationship`
* Add tests for sheet removing funcs
* Add test for `CopyOverride`
* Add tests for `CopySheet`, `CopySheetByName`

spreadsheet: update merged cell references when inserting rows

Fixes unidoc#212

spreadsheet: support inserting rows within a sheet

Fixes unidoc#203

spreadsheet: support inserting rows within a sheet

Fixes unidoc#203

common: handle unordered relationships correctly

Continued part of unidoc#198 after @JasonFromSpace pointed out
an error with the original fix.

meta: add go.mod

meta: add go.mod