The inline string struct is actually the same
as the shared strings struct, reuse it.

Note that Go version 1.10 is required.

Fixes #462

- Testing case for set and get doc properties
- Update charts struct XML tags

This adds outlinePr support, with the summaryBelow attribute
which defaults to true.

Closes #304

Signed-off-by: Michael Harris

new feature: protect sheet support, relate issue #273

Change `allowBlank`, `ShowErrorMessage` and `ShowInputMessage` type as boolean, add new field `ShowDropDown`, change fields orders follow as ECMA-376-1:2016 18.3.1.32.

- go test and godoc has been updated

Add SetSheetPrOptions and GetSheetPrOptions to allow to set options on
<sheetPr> and <pageSetUpPr>.

The following options are implemented:
- CodeName (string)
- EnableFormatConditionsCalculation (bool)
- Published (bool)
- FitToPage (bool)
- AutoPageBreaks (bool)

Two new methods:
- SetSheetViewOptions(sheetName string, viewIndex int, opts ...SheetViewOption) error
- GetSheetViewOptions(sheetName string, viewIndex int, opts ...SheetViewOptionPtr) error

The option values are given by the user through types that have privates methods
that implement the private SheetViewOption and SheetViewOptionPtr interfaces:
- DefaultGridColor(bool)
- RightToLeft(bool)
- ShowFormulas(bool)
- ShowGridLines(bool)
- ShowRowColHeaders(bool)

Examples:
    err := xl.SetSheetViewOptions("Sheet1", -1, excelize.ShowGridLines(true))

    var showGridLines excelize.ShowGridLines
    err := xl.GetSheetViewOptions("Sheet1", -1, &showGridLines)

Fixes #145.

Signed-off-by: Ri Xu <xuri.me@gmail.com>

- go test and godoc updated

- go test updated

- Format code and update readme

- Unify the index row number index of functions `SetRowHeight()` and `GetRowHeight()` relate issue #68;
- Unify the return value data type of functions  `SetColWidth()` and `GetColWidth()`;
- go test updated

- gofmted with -s

- Partial logic performance optimization, use pointer reference instead of a pass the variable value;
- Add comments for content types struct definition;
- Update go test `TestSetBorder` section

- Function parameter code is simplified;
- Fix element `Tint` value parsing error in worksheet;
- Update go test

- Add escape characters of sheet name;
- Update go test and fix typo

- New functions `GetActiveSheetIndex`, `GetSheetName` and `GetSheetMap` added.

- Update workbook and sheet relationships and self-close tag replacement hack functions

- Compatibility improved: relationship namespace in `workbook.xml` has been changed (`xmlns:mc`, `xmlns:x15` and `mc:Ignorable` added)