Acquisition mode mapping for scienta txt reader

[lukaspie]

Takes into account that NXenergydispersion/energy_scan_mode has an enumeration that the reader should map to.

[coveralls]

Pull Request Test Coverage Report for Build 8645870201

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 64.502%

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Totals
Change from base Build 8567922651:	0.0%
Covered Lines:	2195
Relevant Lines:	3403

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💛 - Coveralls