Fix

Load from the file subtotals for PivotFields part2

Load from the file subtotals for PivotFields

Merge pull request #553 from kendallb/feature/xlworkbook-interface ...

Added interface file for XLWorkbook

Fix dates based on 1904 system.

Merge pull request #592 from igitur/issue590-oom-small-file ...

Improve pivot table saving by looking only at cells used.

Remove pageSetup.copies attribute if it's 0

Improve pivot table saving by looking only at cells used.

Merge pull request #575 from bsermons/develop ...

Fix error when copying sheets with certain image anchors

Fix error when copying sheets with certain image anchors

Invalid Print Area fix (issue 578) ...

The modified code will not try to add an (invalid) print area to an unnamed worksheet, avoiding the unhandled exception.

Sorted methods/fields alphabetically according to CodeMaid conventions

improve FACTDOUBLE and add unit tests ...

FACTDOUBLE now throws correct exceptions and

improve Fact (throw correct exceptions on invalid input), add unit tests

improve COMBIN and add unit tests ...

COMBIN did not handle non-numeric values correctly. Should throw NumberException (#NUM in Excel). Returned 0 for any non-numeric parameter instead before

Merge pull request #572 from jongleur1983/feature/functionsAndTests-MathTrigStartingWithAtoB-exceptAggregate ...

Add all missing functions starting with A and B, except AGGREGATE

implement BASE and corresponding unit tests

throw correct exceptions on ATANH and add unit tests

fix ATAN2 implementation and add tests ...

Math.Atan2() expects y as first parameter and x as second, while in Excel x is first,
throw "correct" exception on input (0, 0)

add unit tests

OutOfMemoryException. Some range disposing.

improve ASIN: throw NumberException for values not in range for Excel ...

...add unit tests for ASIN

implement ARABIC and unit tests

restrict valid input range to [1..) as in Excel, add unit tests.

fix ACOS implementation: in Excel only defined in range [-1, 1] ...

if input is not in range, throw exception.

adding unit tests for ACOS

As AppVeyor complains about C#7 features, let's tell VS to use C#6.

Merge pull request #567 from jongleur1983/feature/moreTrigonometry ...

Implement more (all remaining?) trigonometric functions

fix C# version compatibility issue - thanks for the hint ;)

implement SECH function and corresponding tests

implement SEC and corresponding unit tests

implement ACOTH function and corresponding unit tests