FIX - WMS GetCapabilities should report correct values for regular dimension

[Bang Pham Huu]

For example, a regular Time axis is reported as:

"2020-12-31T12:00:00.000Z"/"2021-01-02T12:00:00.000Z"/1d

This is interpreted as 3 time values:

2020-12-31T12:00:00.000Z
2021-01-01T12:00:00.000Z
2021-01-02T12:00:00.000Z

which is incorrect, because the axis actually has 2 slices (timestamps imported from filenames):

20210101.tif
20210102.tif

Hence, petascope should not return the geo extent of that regular Time axis as the extended extent by half pixel in both lower and upper bounds (pixel-is-area), but it should return the non-extended extent which is:

"2021-01-01T00:00:00.000Z"/"2021-01-02T00:00:00.000Z"/1d